what was then the world's deadliest commercial airline disaster. In 1958, Flight 736 crashed in southern Nevada after colliding with a USAF F-100 fighter jet. And on December 16, 1960, Flight 826 hit another TWA Super Constellation over New York City. These accidents helped pave the way for modern Air Traffic Control. Also in 1958, United received its first Douglas DC-8, its first jet aircraft.