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
El Al ("Starting Dec. 23, the Atlantic Ocean will be 20% smaller") to promote its non-stop transatlantic flights. This was a bold step: the airline industry had never used images of the ocean in its advertising because of the widespread public fear of airline crashes. The advertisement, which ran only once, proved effective. Within a year, El Al's sales tripled. Despite the purchase of its Britannias and inauguration of non-stop transatlantic flights the airline remained unprofitable. When Efraim Ben-Arzi took over the company in the late 1950s, the Britannias were replaced in the next decade by the Boeing 707 and Boeing 720