Boeing 707 lb (57.8 kN) with water injection. Maximum takeoff weight was 247,000 lb and first flight was on December 20, 1957. Major orders were the launch order for 20 707-121 aircraft by Pan Am and an American Airlines order for 30 707-123 aircraft. The first revenue flight was on October 26, 1958; 56 were built, plus seven short-bodied −138s; the last −120 was delivered to Western in May 1960. The 707-138 was a −120 with a fuselage 10 ft shorter than the others, with 5 ft (three frames) removed ahead and behind the wing, giving increased range. Maximum takeoff weight was
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