Boeing 707 ushering in the Jet Age. It established Boeing as one of the largest manufacturers of passenger aircraft, and led to the later series of airliners with "7x7" designations. The later 720, 727, 737, and 757 share elements of the 707's fuselage design. The 707 was developed from the Boeing 367-80, a prototype jet first flown in 1954. A larger fuselage cross-section and other modifications resulted in the initial-production 707-120, powered by Pratt & Whitney JT3C turbojet engines, which first flew on December 20, 1957. Pan American World Airways began regular 707 service on October 26, 1958. Later derivatives included the
Longest flights in 23 hours, 19 minutes. In June 1961, an El Al Boeing 707-320 flew a route from New York City-JFK to Tel Aviv averaging 9 hours, 33 minutes. This route was previously tested in December 1957 with a Bristol Britannia. In August 1967, Aerolíneas Argentinas established its non-stop Boeing 707-320B service on a route between Madrid and Buenos Aires with a flight time of 12 hours. The arrival of the more fuel-efficient turbofans made easier the possibility of longer flights. The Aerolíneas Argentinas route was the longest scheduled flight by distance until 1976, when the Boeing 747-SP entered service. In