Media playback is unsupported on your device Media caption Jonathan Head says planes from military base in Australia are leading the search 
 
 A second day of searching for sightings of possible debris from a missing Malaysian airliner in the southern Indian Ocean has proved fruitless. 
 
 The operation is due to start again on Saturday with extra vessels joining the search, Australian officials say. 
 
 Five aircraft took part in Friday's search for flight MH370, which vanished two weeks ago with 239 people on board. 
 
 Satellite images have revealed objects possibly related to the plane in waters far south-west of Western Australia. 
 
 Bad weather had initially hampered Thursday's operation, but conditions improved on Friday. 
 
 Experts have warned that the searchers face extremely treacherous seas and that a recovery operation would be very dangerous. 
 
 'Gut-wrenching business' 
 
 Operations were halted on Friday at nightfall, the Australian Maritime Safety Authority (Amsa) confirmed. It added that an Australian navy ship, HMAS Success, was on its way to the search area. 
 
 In an earlier press conference, Malaysian authorities said the vessel was expected to "reach the vicinity of the objects tomorrow [Saturday]". 
 
 Image copyright Amsa Image caption Australian authorities said one of the objects on the satellite images was 24m in size 
 
 Image copyright Amsa Image caption The objects were seen on satellite images dated 16 March and assessed by experts 
 
 Other countries deploying additional assets included China, Japan and the United Kingdom, Malaysian Transport Minister Hishammuddin Hussein said. 
 
 He added that a French delegation was also assisting "with their considerable experience and expertise". 
 
 The team "includes a man who led the investigation into the Air France (Flight) 447 crash", Mr Hussein said. 
 
 Australian Prime Minister Tony Abbott earlier described the search as "a gut-wrenching business for so many people, not least those who are charged with keeping their citizens safe". 
 
 Media playback is unsupported on your device Media caption Tony Abbott: "If there is anything down there, we will find it" 
 
 "It's about the most inaccessible spot that you can imagine on the face of the earth, but if there is anything down there, we will find it," said Mr Abbott, who is currently visiting Papua New Guinea. 
 
 "We owe it to the families of those people (on board) to do no less." 
 
 But he also cautioned that the objects spotted by the satellites could be unrelated to the plane. 
 
 Flight MH370 was flying from Kuala Lumpur to Beijing when it lost contact with air traffic controllers and disappeared from radar at 00:41 Saturday, 8 March (16:41 GMT, 7 March). 
 
 Satellite data has led to a search in two corridors to the north and south of its last known location in the Malacca Straits - the opposite direction from its flight path. 
 
 Image copyright AFP Image caption The St Petersburg, a Norwegian merchant ship, was the first vessel to reach the area 
 
 Malaysian officials say they believe the plane was intentionally diverted. Authorities in many countries have scrutinised the backgrounds of both passengers and crew on board but say they have no substantive leads. 
 
 Other reports of debris to date have proved not to be linked to the missing plane. 
 
 Four military planes, including three Orions belonging to the Royal Australian Air Force, were taking part in the search, Amsa said. A civilian Bombardier Global Express is also involved. 
 
 The aircraft are searching a 23,000 sq km area, about 2,500 km (1,550 miles) south-west of Perth, Amsa said. 
 
 Each aircraft is able to search for no more than two hours, due to the distance from land. 
 
 China said it was sending three navy vessels to the search area. It also has an icebreaker in Perth that could join the search, its National Maritime Search and Rescue Centre said. 
 
 Two merchant ships have also joined the search. 
 
 Image copyright Amsa 
 
 'False information' 
 
 On Thursday, Malaysian authorities described the debris sighting as a "credible lead". 
 
 The largest object appeared to be 24m (78ft) in size, the Australian authorities said. 
 
 Correspondents say many families are hoping the objects are not debris from the plane, as they are holding on to hope that their relatives could be alive somewhere. 
 
 Wen Wancheng, whose 33-year-old son Wen Yongsheng was on the plane, said: "What wreckage? In a few days they are going to say it's not true. 
 
 "[The Malaysian authorities] need to stop giving us false information. I simply don't believe them any more." ||||| 6.46pm GMT 
 
 We're going to wrap up this coverage now, but colleagues in Australia will have the latest developments from there as search teams once again head out to the southern Indian Ocean at dawn on Saturday. 
 
 Here is what we have learned so far: 
 
 • Friday's search of the southern Indian Ocean yielded no sightings of debris from missing flight MH370. Five aircraft took part – three Australian Orions, a long-range Bombardier Global Express corporate jet and a US Navy P8 – flying very low, with the search conducted by officers looking out of the window, after radar proved ineffective. The search will resume on Saturday at dawn. 
 
 • Questions have been asked about the possible risk to the flight of a consignment of lithium ion batteries that were in the cargo. Ahmad Jauhari Yayha, the MAS Group CEO, said these were not classed as dangerous goods and it was common for airlines to transport them, but reports suggested such batteries were known to be unstable at altitude and could catch fire if not transported correctly. 
 
 • Relatives of Chinese passengers who were on board flight MH370 had a two-hour meeting in Beijing with Malaysian authorities but reported that no new information was passed on to them. 
 
 • The Telegraph has printed details of what it says was the full transcript of communications between the co-pilot and air traffic controllers in Malaysia. They reveal the exchanges were "pretty routine". 
 
 • The UK is sending HMS Echo to assist in the search effort, although it will take more than a week to reach the right area. Rather sooner to arrive will be the Chinese icebreaker Xue Long, which has left western Australia and should reach the zone in four days or so. ||||| KUALA LUMPUR, March 21 (Reuters) - If two blurred objects photographed from space are confirmed as debris from Flight MH370, scientists will still face a daunting task to find and recover the sensitive recorders containing clues to the Malaysian jet's disappearance. 
 
 With so little known about why the Beijing-bound Malaysia Airlines flight changed course and disappeared after leaving Kuala Lumpur on March 8, finding the 'black boxes' is seen as the only real hope of understanding what happened to the plane and the 239 people on board. 
 
 Australian Prime Minister Tony Abbott on Thursday said objects possibly belonging to the plane had been discovered in the Indian Ocean. The area is around 2,500 km (1,500 miles) southwest of Perth, above a volcanic ridge in waters estimated to be 2,500 to 4,000 metres (8,200 to 13,120 feet) deep. 
 
 It roughly corresponds to the far end of a southern track the aircraft could have taken after investigators suspect it was deliberately diverted. 
 
 "It can be incredibly rough and difficult. It can be very windy with strong currents, though it can equally be calm," said David Gallo, director of special projects at the Woods Hole Oceanographic Institution (WHOI) in Falmouth, Massachusetts, referring to the general area where the objects were seen. 
 
 Flight MH370's disappearance has been compared to the 2009 Air France jet disaster, which puzzled investigators until a mission led by WHOI found the black boxes in 3,900 metres (12,800 feet) of water. 
 
 But whereas investigators knew roughly where Flight AF447 had hit the Atlantic Ocean on a stormy night in June 2009, search crews know much less about where the Malaysian jet ended up, including whether or where it ran out of fuel. 
 
 "If it is confirmed as debris, then the first priority is to recover and record each piece and see how high or low it is sitting in the water. This may help indicate how it has been moved by currents and winds," said Gallo, who took part in the Air France search. 
 
 DEBRIS COULD HAVE MOVED 
 
 The immediate problem will be to find the debris, which may have moved since the satellite images were taken on March 16. 
 
 It could take several days to verify the satellite lead, a source close to the investigation said. Military aircraft from Australia, the United States and New Zealand have so far found nothing during a search hampered by strong winds and rain. Neither has a merchant ship in the area. 
 
 If the objects - the biggest measures up to 24 metres (79 feet) - are from the Boeing 777, recovery teams will work as quickly as possible to locate the rest of the wreckage in the hope it leads them to the data and cockpit voice recorders. 
 
 To do this, scientists have developed computer models to effectively play waves and winds backwards, allowing rescue workers to retrace the movements of debris to the site of a crash. 
 
 "There are sophisticated models that allow you to work backwards from the current position of each piece of debris, after considering the currents and the winds and so on," said Gallo. 
 
 "That enables you to say X marks the spot on the surface." 
 
 Investigators hope such recent developments in oceanography will help shed light on the baffling disappearance of Flight MH370. 
 
 But not all experts agree computer simulations will easily replace the gruelling routine of searching from the air and the sea. 
 
 Although research has continued since the Air France jet ploughed into the Atlantic, a detailed annex to the report on that disaster, which was blamed mainly on pilot error, raised questions in 2012 over the consistency of such "retro-drift" calculations. 
 
 For example, when the French Navy dropped special buoys at the same spot a year after the crash they scattered hundreds of miles apart, highlighting the turbulence of ocean currents. 
 
 RACE AGAINST TIME 
 
 If the report of suspected debris is confirmed, naval vessels will also drag a sonar through the water to seek the black boxes through radio beacons, but time for this is running out. 
 
 The black boxes are designed to have a battery life of at least 30 days, leaving possibly only 17 days to locate them before the signals die. 
 
 But for every knot, or nautical mile per hour, of current in the rough waters of the southern Indian Ocean, an object could theoretically float for 312 miles (500 km) in 13 days, the time the Malaysian plane has been missing. 
 
 That could present investigators with a much larger potential search area than the 40-mile radius for AF447. 
 
 In 2012, France's BEA air crash investigation agency recommended in its report on the Air France disaster that the battery life on locator beacons be increased to 90 days. 
 
 Although this has been backed by global regulators, it will not become mandatory until towards the end of the decade. 
 
 Other proposals that could potentially make it easier to find MH370 remain bogged down in talks between regulators and the aviation industry, with no timetable for putting them into effect, Reuters reported last week. 
 
 These include adding a new frequency for the beacons so that their signals travel further and can more easily be heard by military ships lacking specialist air crash recovery equipment. 
 
 Existing signals travel about 2,000 to 3,000 metres (6,560 to 9,840 feet) under water, according to the French sea search annex, whereas the area now being combed for debris is up to 4,000 metres deep. 
 
 To close this gap, search teams would bring in boats capable of carrying several miles of cables to drag sonars at lower depths, but experts note moving them into place can take time. 
 
 If by the end of 30 days nothing is found, the search could rely on remote underwater vehicles to scour the seabed. 
 
 To find the Air France wreckage, WHOI used remote-operated REMUS underwater vehicles developed by the U.S. Navy. 
 
 "It was the biggest use of deep-ocean firepower in one spot," Gallo said. (Editing by Dean Yates) ||||| Story highlights Planes depart Australia to resume their search for airplane debris 
 
 Official: Passengers' relatives are moved to a different Kuala Lumpur hotel 
 
 Objects seen on satellite spark intensive search in southern Indian Ocean 
 
 U.S. officials: Files were deleted from flight simulator's hard drive after February 3 
 
 Two weeks. Two gut-wrenching, frustrating, mysterious weeks. 
 
 That's how long it's been since 227 passengers and 12 crew members boarded Malaysia Airlines Flight 370, destined for Beijing. A routine trip, it seemed, to catch up relatives in time for the weekend, start on a work assignment or just get away. 
 
 Where they got to, still unknown. An exhaustive search -- covering a mind-boggling 2.97 million square miles, which is nearly the size of the continental United States -- has yielded some clues, but no proof of where the Boeing 777 is or definitively what happened to it. 
 
 The latest, most notable lead revolved around two large objects detected by satellite Sunday floating on waters over 1,400 miles off of Australia's west coast. 
 
 The first of several Australian military planes, as well as two long-range commercial jets, resumed their search Saturday morning to find any trace of the objects, amid some skepticism that they or ships in the area ever will and, if they do, that whatever they find will be related to the missing aircraft. 
 
 Australian Prime Minister Tony Abbott on Friday defended the decision to announce the find, saying Australia owes it to families of those missing "to give them information as soon as it's to hand." But he didn't make any promises. 
 
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 "It could just be a container that has fallen off a ship," Abbott said during a visit to Papua New Guinea. "We just don't know." 
 
 On Friday, Hishammuddin Hussein, Malaysia's interim transportation minister, tried to reset expectations for a quick resolution to the mystery after the satellite discovery. 
 
 "This is going to be a long haul," he said. 
 
 Search intensifies 
 
 After tough weather Thursday, conditions improved Friday to allow flight crews to look with their eyes rather than relying all on radar, said John Young, the Australian Maritime Safety Authority's emergency response manager. 
 
 "That's encouraging," he said. "But we have no sightings yet." 
 
 The United Kingdom was sending the HMS Echo to aid a growing international flotilla searching the southern Indian Ocean. Australia is sending a ship, the HMAS Success. And Malaysian and Chinese vessels -- including the icebreaker Xue Long, or Snow Dragon, as reported by China's official Xinhua news agency -- are also steaming to join a massive Norwegian cargo ship diverted there Thursday at Australia's request plus a motley collection of merchant ships heading to the search area. 
 
 The window for finding the objects in the target area could be narrow. Another round of bad weather like the one that hampered the initial day of searching Thursday could rake the area, according to CNN meteorologists. 
 
 Photos: The search for MH370 Photos: The search for MH370 Two years after Malaysia Airlines Flight 370 went missing, a relative of one of the passengers burns incense in Beijing on March 8, 2016. Flight 370 vanished on March 8, 2014, as it flew from Kuala Lumpur, Malaysia, to Beijing. There were 239 people on board. Hide Caption 1 of 43 Photos: The search for MH370 On July 29, police carry a piece of debris on Reunion Island, a French territory in the Indian Ocean. A week later, authorities confirmed that the debris was from the missing flight. Hide Caption 2 of 43 Photos: The search for MH370 Staff members with the Australian Transport Safety Bureau examine a piece of aircraft debris at their laboratory in Canberra, Australia, on July 20. The flap was found in June by residents on Pemba Island off the coast of Tanzania, and officials had said it was highly likely to have come from Flight 370. Experts at the Australian Transport Safety Bureau, which is heading up the search for the plane, confirmed that the part was indeed from the missing aircraft. Hide Caption 3 of 43 Photos: The search for MH370 In late February, American tourist Blaine Gibson found a piece of plane debris off Mozambique, a discovery that renewed hope of solving the mystery of the missing flight. The piece measured 35 inches by 22 inches. A U.S. official said it was likely the wreckage came from a Boeing 777, which MH370 was. Hide Caption 4 of 43 Photos: The search for MH370 Relatives of the flight's passengers console each other outside the Malaysia Airlines office in Subang, Malaysia, on February 12, 2015. Protesters had demanded that the airline withdraw the statement that all 239 people aboard the plane were dead. Hide Caption 5 of 43 Photos: The search for MH370 A police officer watches a couple cry outside the airline's office building in Beijing after officials refused to meet with them on June 11, 2014. The couple's son was on the plane. Hide Caption 6 of 43 Photos: The search for MH370 Members of the media scramble to speak with Azharuddin Abdul Rahman, director general of Malaysia's Civil Aviation Department, at a hotel in Kuala Lumpur, Malaysia, on May 27, 2014. Data from communications between satellites and the missing flight was released the day before, more than two months after relatives of passengers said they requested it be made public. Hide Caption 7 of 43 Photos: The search for MH370 Operators aboard the Australian ship Ocean Shield move Bluefin-21, the U.S. Navy's autonomous underwater vehicle, into position to search for the jet on April 14, 2014. Hide Caption 8 of 43 Photos: The search for MH370 A member of the Royal New Zealand Air Force looks out of a window while searching for debris off the coast of western Australia on April 13, 2014. Hide Caption 9 of 43 Photos: The search for MH370 The HMS Echo, a vessel with the British Roya; Navy, moves through the waters of the southern Indian Ocean on April 12, 2014. Hide Caption 10 of 43 Photos: The search for MH370 A Royal Australian Air Force AP-3C Orion, on a mission to drop sonar buoys to assist in the search, flies past the Australian vessel Ocean Shield on April 9, 2014. Hide Caption 11 of 43 Photos: The search for MH370 A relative of a missing passenger cries at a vigil in Beijing on April 8, 2014. Hide Caption 12 of 43 Photos: The search for MH370 Australian Defense Force divers scan the water for debris in the southern Indian Ocean on April 7, 2014. Hide Caption 13 of 43 Photos: The search for MH370 A towed pinger locator is readied to be deployed off the deck of the Australian vessel Ocean Shield on April 7, 2014. Hide Caption 14 of 43 Photos: The search for MH370 A member of the Royal New Zealand Air Force looks at a flare in the Indian Ocean during search operations on April 4, 2014. Hide Caption 15 of 43 Photos: The search for MH370 On March 30, 2014, a woman in Kuala Lumpur prepares for an event in honor of those aboard Flight 370. Hide Caption 16 of 43 Photos: The search for MH370 The sole representative for the families of Flight 370 passengers leaves a conference at a Beijing hotel on March 28, 2014, after other relatives left en masse to protest the Malaysian government's response to their questions. Hide Caption 17 of 43 Photos: The search for MH370 A member of the Royal Australian Air Force is silhouetted against the southern Indian Ocean during the search for the missing jet on March 27, 2014. Hide Caption 18 of 43 Photos: The search for MH370 Flight Lt. Jayson Nichols looks at a map aboard a Royal Australian Air Force aircraft during a search on March 27, 2014. Hide Caption 19 of 43 Photos: The search for MH370 People in Kuala Lumpur light candles during a ceremony held for the missing flight's passengers on March 27, 2014. Hide Caption 20 of 43 Photos: The search for MH370 Malaysian Prime Minister Najib Razak, center, delivers a statement about the flight on March 24, 2014. Razak's announcement came after the airline sent a text message to relatives saying it "deeply regrets that we have to assume beyond any reasonable doubt that MH 370 has been lost and that none of those onboard survived." Hide Caption 21 of 43 Photos: The search for MH370 Grieving relatives of missing passengers leave a hotel in Beijing on March 24, 2014. Hide Caption 22 of 43 Photos: The search for MH370 A passenger views a weather map in the departures terminal of Kuala Lumpur International Airport on March 22, 2014. Hide Caption 23 of 43 Photos: The search for MH370 A Chinese satellite captured this image, released on March 22, 2014, of a floating object in the Indian Ocean, according to China's State Administration of Science. It was a possible lead in the search for the missing plane. Surveillance planes were looking for two objects spotted by satellite imagery in remote, treacherous waters more than 1,400 miles from the west coast of Australia. Hide Caption 24 of 43 Photos: The search for MH370 Satellite imagery provided by the Australian Maritime Safety Authority on March 20, 2014, showed debris in the southern Indian Ocean that could have been from Flight 370. The announcement by Australian officials raised hopes of a breakthrough in the frustrating search. Hide Caption 25 of 43 Photos: The search for MH370 Another satellite shot provided by the Australian Maritime Safety Authority shows possible debris from the flight. Hide Caption 26 of 43 Photos: The search for MH370 A distraught relative of a missing passenger breaks down while talking to reporters at Kuala Lumpur International Airport on March 19, 2014. Hide Caption 27 of 43 Photos: The search for MH370 On March 18, 2014, a relative of a missing passenger tells reporters in Beijing about a hunger strike to protest authorities' handling of information about the missing jet. Hide Caption 28 of 43 Photos: The search for MH370 U.S. Navy crew members assist in search-and-rescue operations in the Indian Ocean on March 16, 2014. Hide Caption 29 of 43 Photos: The search for MH370 Members of the Chinese navy continue search operations on March 13, 2014. After starting in the sea between Malaysia and Vietnam, the plane's last confirmed location, search efforts expanded west into the Indian Ocean. Hide Caption 30 of 43 Photos: The search for MH370 A Vietnamese military official looks out an aircraft window during search operations March 13, 2014. Hide Caption 31 of 43 Photos: The search for MH370 Malaysian air force members look for debris near Kuala Lumpur on March 13, 2014. Hide Caption 32 of 43 Photos: The search for MH370 Relatives of missing passengers wait for the latest news at a hotel in Beijing on March 12, 2014. Hide Caption 33 of 43 Photos: The search for MH370 A member of the Vietnamese air force checks a map while searching for the missing plane on March 11, 2014. Hide Caption 34 of 43 Photos: The search for MH370 A Vietnamese air force plane found traces of oil that authorities had suspected to be from the missing Malaysia Airlines plane, the Vietnamese government online newspaper reported on March 8, 2014. However, a sample from the slick showed it was bunker oil, typically used to power large cargo ships, Malaysia's state news agency, Bernama, reported on March 10, 2014. Hide Caption 35 of 43 Photos: The search for MH370 A U.S. Navy Seahawk helicopter lands aboard the USS Pinckney to change crews on March 9, 2014, before returning to search for the missing plane in the Gulf of Thailand. Hide Caption 36 of 43 Photos: The search for MH370 Buddhist monks at Kuala Lumpur International Airport offer a special prayer for the missing passengers on March 9, 2014. Hide Caption 37 of 43 Photos: The search for MH370 Members of a Chinese emergency response team board a rescue vessel at the port of Sanya in China's Hainan province on March 9, 2014. Hide Caption 38 of 43 Photos: The search for MH370 The rescue vessel sets out from Sanya in the South China Sea on March 9, 2014. Hide Caption 39 of 43 Photos: The search for MH370 Malaysian Prime Minister Najib Razak, center, arrives to meet family members of missing passengers at the reception center at Kuala Lumpur International Airport on March 8, 2014. Hide Caption 40 of 43 Photos: The search for MH370 A relative of two missing passengers reacts at their home in Kuala Lumpur on March 8, 2014. Hide Caption 41 of 43 Photos: The search for MH370 Chinese police at the Beijing airport stand beside the arrival board showing delayed Flight 370 in red on March 8, 2014. Hide Caption 42 of 43 Photos: The search for MH370 Malaysia Airlines Group CEO Ahmad Juahari Yahya, front, speaks during a news conference at a hotel in Sepang on March 8, 2014. "We deeply regret that we have lost all contacts" with the jet, he said. Hide Caption 43 of 43 
 
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 Locator beacons are also an issue. They are designed to sound for at least 16 more days and could continue to go off for a few more after that, according to the company that believes it made the device installed on the missing plane. 
 
 But the ocean depths in the search area could make finding them very difficult, experts say. 
 
 U.S. Defense Secretary Chuck Hagel -- who talked Friday with Hishammuddin, who is also Malaysia's defense minister -- has ordered the Navy and policy experts to look at the availability and usefulness of U.S. military undersea technology to try to find the plane's wreckage and its data recorders, a U.S. military official said. 
 
 Hishammuddin has put out a call for underwater listening devices called hydrophones to aid the search. 
 
 Search continues elsewhere 
 
 The United States, which has had a P-8 aircraft working out of Perth, Australia, and Navy ships involved in the search, has so far spent $2.5 million on the entire effort, Pentagon spokesman Col. Steven Warren said Friday. 
 
 NASA Administrator Charles Bolden said Friday that he's tasked the U.S. space agency to mine its existing satellite data and also try to capture fresh images that might aid in the search. Its satellites can detect objects as small as 98 feet (30 meters). 
 
 Countries from central Asia to Australia are also engaged in the search along an arc drawn by authorities based on satellite pings received from the plane for hours after it vanished. One arc tracks the southern Indian Ocean zone that's the focus of current attention. 
 
 The other tracks over parts of Cambodia, Laos, China and into Kazakhstan. Hishammuddin said Friday that Malaysian authorities were awaiting permission from Kazakhstan's government to use the country as a staging area for the northern corridor search. 
 
 That clearly signals that Malaysian authorities are not giving up on the possibility the plane could still be found far from the focus of current search efforts. 
 
 "Obviously, the search now has taken a global perspective," Hishammuddin said. 
 
 More details emerge 
 
 At Friday's daily news briefing, Malaysia Airlines CEO Ahmad Jauhari Yahya said authorities knew of news reports that Flight 370's pilot, Capt. Zaharie Ahmad Shah, placed a cell phone call shortly before his plane departed. 
 
 He said they had passed the information to investigators. The significance of the call was unclear. 
 
 As to other communications, The Telegraph reported Friday it had a transcript documenting 54 minutes of back-and-forth between the cockpit and ground control from taxiing in Kuala Lumpur to the final message of "All right, good night." CNN hasn't confirmed that this reported transcript it genuine, and The Telegraph said Malaysia's prime minister said the transcript wouldn't be officially released. 
 
 The alleged transcript reported by the Telegraph contains seemingly routine conversations about which runway to use and what altitude to fly at. 
 
 One unexplained element, according to the British newspaper, is a call in which someone in the cockpit stated the aircraft was at a cruising altitude of 35,000 feet -- something that had been done just six minutes earlier. Twelve minutes after that comes the "good night" message, at a point Flight 370 was being transferred to Vietnam's control. 
 
 Another wrinkle: Ahmad Jauhari acknowledged the plane was carrying a cargo of lithium-ion batteries, although he didn't specify the volume of the shipment. 
 
 Lithium-ion batteries are commonly used in laptops and cell phones and have been known to explode, although that occurs rarely. 
 
 They were implicated in the fatal crash of a UPS cargo plane in Dubai in 2010, and lithium-ion batteries used to power components on Boeing 787s were blamed for fires in those planes. 
 
 There's no evidence the batteries played a role in the plane's disappearance, and Yahya said they are routine cargo aboard aircraft. 
 
 "They are not declared dangerous goods" he said, adding that they were "some small batteries, not big batteries." 
 
 Deleted files sought 
 
 Malaysian authorities say they believe the missing plane was deliberately flown off course on its scheduled flight from Kuala Lumpur to Beijing. But they haven't so far found clear evidence to indicate who might have changed the plane's path and why. 
 
 The pilot and first officer have come under scrutiny, especially in light of information suggesting a sharp turn had been programmed into the plane's flight management system before one of the pilots gave a routine sign-off to Malaysian air traffic controllers. 
 
 Plus, question marks remain over data authorities say was deleted from the hard drive of a flight simulator found at Zaharie's home. 
 
 A U.S. official familiar with the investigation told CNN on Thursday that an FBI team is confident it can retrieve at least some of the deleted files. 
 
 On Friday, U.S. law enforcement officials told CNN files were removed closer to the flight's departure than was previously indicated. Malaysia's Hishammuddin had said items were deleted before February 3, but American investigators now say such deletions happened after that date. 
 
 Law enforcement officials aren't drawing any conclusions about the subsequent deletions -- or the earlier ones -- just two days into reviewing the hard drive substantial contents. It is still not clear, for example, who erased the files, why they did and what was in them. 
 
 Investigators are also analyzing websites that Zaharie and the first officer, Fariq Ab Hamid, may have visited recently, the official said on the condition of anonymity. 
 
 Map: The search area 
 
 Passengers also continue to be investigated. On Friday, Hishammuddin said Ukraine told Malaysia that background checks on its citizens aboard the plane had come back clear. 
 
 Families frustrated 
 
 The length of the search and the lack of concrete information has angered many family members. Some have accused Malaysian officials of withholding details, or at the very least failing to update them. 
 
 For the first time since the plane disappeared, Malaysia sent a high-level delegation to Beijing to brief relatives who had opted not to travel to Malaysia to wait out the search. 
 
 Hishammuddin said the 3½-hour meeting went as well as could be expected, but,"Although we answered most of the questions they raised, we could not answer them all," he said. 
 
 "The one question that they really want to know is the answer to which we do not have," he said, "which is: 'Where are their loved ones, and where is the airplane?'" 
 
 Passengers' relatives in Kuala Lumpur were moved from the Cyberview Hotel to another, unspecified hotel because the Cyberview is booked for the upcoming Malaysian Grand Prix race, said a hotel official who prefers to remain anonymous because she is not authorized to speak to the media. 
 
 Selamat Omar, whose son was on board the plane, told CNN's Kate Bolduan the wait for answers has been agonizing. 
 
 "I do feel sad, it's been 14 days," he said. "I'm still waiting for answers from the government. The sadness is still there, but I'm just going to stay strong." 
 
 Omar's son, Khairul Amri, has attracted the attention of authorities because of his experience as a flight engineer. Omar said authorities have not contacted him and he is confident his son had nothing to do with the plane's disappearance. ||||| Most of the planes scouring the remote southern Indian Ocean for debris from missing Flight 370 only have a two-hour search window, officials said Friday. 
 
 “They only have two hours [of] search time when they get there because of the distance it takes to get to the area,” an Australian Maritime Safety Authority spokesperson told NBC News. “It’s a seven-hour round trip and a two-hour search time so they are in the air nine hours.” 
 
 The search zone is about 1,400 miles southwest of Perth, Australia, limiting the amount of time that aircraft can search the waters before returning to refuel. That distance is farther than a trip between New York and Oklahoma City. 
 
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 Five planes took off from Perth on Friday, including a U.S. Navy P-8 Poseidon, three Royal Australian Air Force P3 Orions and “an ultra-long range” Bombardier Global Express. 
 
 A second merchant ship was expected to join the auto carrier Hoegh St. Petersburg in the isolated ocean zone later Friday. 
 
 A total of six vessels have assisted the search in the region before they were released from tasking, they added. 
 
 - Henry Austin 
 
 First published March 21 2014, 1:49 AM
– The search for what investigators say is the "best lead" so far in the disappearance of Malaysia Airlines Flight 370 resumed in earnest at daybreak today as boats and planes searched a patch of the southern Indian Ocean for possible plane debris. So far, there has been no trace of the floating debris seen on a satellite image. Search teams ended today's mission without finding anything, CNN reports. A total of four military planes and one civilian plane joined the search today in an area Australian Prime Minister Tony Abbott describes as "about the most inaccessible spot that you can imagine on the face of the Earth," reports the BBC. China has announced that it is sending three military vessels to the area, and they may be joined by an icebreaker currently in Perth after an Antarctic mission. Australia is now planning to use human spotters—"highly skilled and trained observers" looking out the windows of low-flying planes—to search for the debris rather than radar, the New York Times reports. After two days of fruitless radar searching, an official explains that while humans are slower than radar, they might have a better chance at spotting debris. Weather conditions in the area known as the "Roaring 40s" (due to the frequent storm-force winds in latitudes between 40 and 50 degrees," explains Reuters) have hampered the search so far, and while conditions are improving, fog and low visibility are still a factor, the Guardian finds. Also troublesome: Most of the planes assisting in the search have to deal with a seven-hour round trip to the search area, meaning they only have two hours of actual search time before they have to head back to refuel, according to an Australian official quoted by NBC News. If debris is found, investigators will use computer models to try to retrace it to a crash scene that could be hundreds of miles away. "There are sophisticated models that allow you to work backwards from the current position of each piece of debris, after considering the currents and the winds and so on," an expert who helped locate the black boxes after the 2009 Air France disaster tells Reuters. "That enables you to say X marks the spot on the surface." But an Australia official cautions that the debris may have sunk since the satellite image was taken five days ago. "Something that was floating on the sea that long ago may no longer be floating," he told reporters. "It may have slipped to the bottom."