Boeing 707 center section tanks. Its first flight was on January 11, 1958; 69 turbojet 707-320s were delivered through January 1963, the first passengers being carried (by Pan Am) in August 1959. The 707-420 was identical to the −320, but fitted with Rolls-Royce Conway 508 (RCo.12) turbofans (or by-pass turbojets as Rolls-Royce called them) of 18,000 lb (79 kN) thrust each. The first announced customer was Lufthansa. BOAC's controversial order was announced six months later, but the British carrier got the first service-ready aircraft off the production line. The British Air Registration Board refused to give the aircraft a certificate of airworthiness,
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