guide and two Costa Rican crew. Among the dead was the pilot, Captain Juan Manuel Retana, the cousin of Costa Rica's former president Laura Chinchilla. He had accrued a total of 15,000 flying hours. Before he joined Nature Air, he worked at Costa Rica's regional airline SANSA for 14 years. The other crew member was identified by the Costa Rican media as Emma Ramos. Investigation The Costa Rican Government opened an investigation into the cause of the crash on 1 January 2018. The investigation was conducted by Costa Rica DGAC. The United States National Transportation Safety Board (NTSB) was expected to assist the Costa Rican authorities in the investigation, as most of the passengers were of American origin. On 18 May, the GAC offered to delegate the investigation to the NTSB. The NTSB accepted the offer on 30 May 2018. In the initial stage of the investigation, investigators cited mechanical failure, human factors, and adverse weather condition as the cause of the crash. Multiple reports gathered from eyewitnesses revealed that the weather conditions in Punta Islita were inclement. Gusts of 20 knots (37 km/h; 23 mph) were reported. Another witness stated that the aircraft flew too low. Enio Cubillo, head of the Costa Rican DGAC, stated that the investigation of Flight 9916 would take months. On 8 January 2018, Costa Rica's Organismo de Investigación Judicial (Judicial Investigation Organisation) raided the offices of Nature Air in Tobías Bolaños International Airport in Pavas and the Juan Santamaria International Airport in San José. They also raided the offices of the Costa Rica Dirección General de Aviación Civil in La Uruca as part of the investigation of the crash. At least 30 agents participated in the operation with the objective to obtain files on the pilots and on the Cessna 208 Caravan as well as the identities of those in charge of the maintenance and whoever authorized the flight. In December 2019, two years after the crash, the NTSB released the final report on the accident. It had been caused by the following: Aftermath The crash highlighted the danger of privately chartered tourist passenger flights, causing concern among Costa Ricans who work in the tourism industry. In the immediate aftermath of the crash, Fox News warned their readers about the danger of flying on privately chartered flights, indicating that they are not properly regulated. The former head of the National Transportation Safety Board also