Ellington Airport consists of three active runways (a ILS CAT I runway, an runway, and a runway). The airport supports the operations of the United States military, NASA and a variety of general aviation tenants. The field is a base for NASA's administrative, cargo transport and high-altitude aircraft, which also includes NASA's fleet of T-38 Talon jets bailed to the agency from USAF, Gulfstream Shuttle Training Aircraft, and a former USN C-9 nicknamed the "Weightless Wonder VI" which replaced the former USAF NKC-135 aircraft known as the Vomit Comet, a zero-g trainer. The only two WB-57F aircraft (used for atmospheric research and reconnaissance) still flying in the world today are housed at Ellington.