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
Boeing Field Calgary, Alberta in Canada. West Coast, which had its headquarters in the Seattle area and operated all of its flights from Boeing Field, merged with Pacific Air Lines and Bonanza Air Lines to form Air West (which was later renamed Hughes Airwest) with these successor air carriers continuing to serve Seattle via Boeing Field with DC-9 jets and F-27 propjets until Hughes Airwest moved all of its flights to Seattle-Tacoma International Airport in 1971. Aeroamerica, an airline based at Boeing Field from 1971 to 1982 which operated Boeing 707 and Boeing 720 jetliners, flew nonstop service at one point to