The Boeing 707 prototype first flew in 1954 and the first order was placed by Pan American in 1955. In 1956 BOAC (British Overseas Airways Corporation) ordered 18 of the larger 707-420 'Intercontinental' version of the Boeing 707, powered by Rolls Royce Conway engines instead of the usual Pratt and Whitney JT4A engines.

To comply with British airworthiness requirements a taller fin, rudder and a ventral fin were added. Known as the 707-436 in BAOC service they started flying scheduled services in May 1960.

Markings for:

• Boeing 707-436, G-APFO, operated by BOAC (British Overseas Airways Corporation), 1970
• Boeing 707-437, VT-DJK 'Everest', operated by Air India, 1970