Concorde () is a retired Anglo-French supersonic airliner jointly developed and manufactured by Sud Aviation and the British Aircraft Corporation (BAC). Studies started in 1954, and France and the United Kingdom signed a treaty establishing the development project on 29 November 1962, as the programme cost was estimated at £70 million (£1.68 billion in 2023). Construction of the six prototypes began in February 1965, and the first flight took off from Toulouse on 2 March 1969. The market was predicted for 350 aircraft, and the manufacturers received up to 100 option orders from many major airlines. On 9 October 1975, it received its French certificate of airworthiness, and from the UK CAA on 5 December.

Concorde is a tailless aircraft design with a narrow fuselage permitting four-abreast seating for 92 to 128 passengers, an ogival delta wing, and a droop nose for landing visibility. It is powered by four Rolls-Royce/Snecma Olympus 593 turbojets with variable engine intake ramps, and reheat for take-off and acceleration to supersonic speed. Constructed out of aluminium, it was the first airliner to have analogue fly-by-wire flight controls. The airliner had transatlantic range while supercruising at twice the speed of sound for 75% of the distance.

Delays and cost overruns increased the programme cost to £1.5–2.1 billion in 1976, (£11–16 billion in 2023).