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,
Transair (Canada) scheduled service on Canadian routes followed by the intercontinental version of the Boeing 707 a year later. The Boeing 707-320C was used strictly for charter flights, primarily to international destinations. By 1976 the scheduled route network extended throughout Canada from Toronto in the east to Whitehorse in the west with charter flights being operated to Europe, Mexico, the Caribbean, Hawaii, Florida and other destinations in the U.S. According to the February 1976 edition of the North American Official Airline Guide (OAG), Transair was operating daily scheduled service with either Boeing 737 or Fokker F28 aircraft direct between Toronto (YYZ) and