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
Pan American World Airways Board (CAB) took towards the promotion of competition between major U.S. carriers on key domestic and international scheduled routes compared with pre-war U.S. aviation policy. AOA was the first airline to begin regular landplane flights across the Atlantic, on October 24, 1945. In January 1946 Pan Am scheduled seven DC-4s a week east from LaGuardia Airport, five to London (Hurn airport) and two to Lisbon. Time to Hurn was 17 hours 40 minutes including stops, or 20 hours 45 minutes to Lisbon. A Boeing 314 flying boat flew LaGuardia to Lisbon once every two weeks in 29 hours 30 minutes;