third-largest hub for United Airlines after Chicago O'Hare and Houston George Bush Intercontinental. During a 12-month period ending in March 2022, over 63% of all passengers at the airport were carried by United Airlines. The second-busiest airline is JetBlue Airways, which carries 11.4%, and then American Airlines, which carries 5.6%. The second largest tenant is FedEx, which operates in 3 buildings on around two million square feet of the airport's property. Facilities Runways and taxiways The airport covers and has three runways and one helipad: 4L/22R: , asphalt/concrete, grooved 4R/22L: , asphalt, grooved 11/29: , asphalt, grooved Helipad H1: , asphalt Runway 11/29 is one of the three runways built during World War II. In 1952, Runways 1/19 and 6/24 were closed and a new Runway 4/22 (now 4R/22L) opened at a length of . After 1970, this runway was extended to , shortened for a while to and finally reaching its present length by 2000. Runway 4L/22R opened in 1970 at a length of and was extended to its current length by 2000. EWR has more than 12 miles of 75-foot-wide taxiways. In 2014, the Port Authority completed a $97 million dollar rehabilitation project of Runway 4L/22R while adding four new taxiways to reduce delays. Three of the new taxiways allow multiple planes to stage for departure at the end of the runway, reducing takeoff delays, while the other new taxiway will allow arriving planes to exit the runway faster and get to the gates quicker. All approaches except Runway 29 have Instrument Landing Systems and Runway 4R is certified for Category III approaches. Runway 22L had been upgraded to CAT III approach capability. Runway 4L/22R is primarily used for takeoffs while 4R/22L is primarily used for landings, and 11/29 is used by smaller aircraft or when there are strong crosswinds on the two main runways. Newark's parallel runways (4L and 4R) are apart, the fourth smallest separation of major airports in the U.S., after San Francisco International Airport, Los Angeles International Airport and Seattle–Tacoma International Airport. Helipad H1 is used by Blade, a helicopter service that goes to EWR and JFK from their heliport on East 34th street in New York City with the purpose of going to and from the airport in under 5 minutes. They use the Bell 407 helicopter. Unlike the other two major New York–area airports, JFK and LaGuardia, which are located directly next