An air speed record is the highest airspeed attained by an aircraft of a particular class. The rules for all official aviation records are defined by Fédération Aéronautique Internationale (FAI), which also ratifies any claims. Speed records are divided into multiple classes with sub-divisions. There are three classes of aircraft: landplanes, seaplanes and amphibians; then within these classes, there are records for aircraft in a number of weight categories. There are still further sub-divisions for piston-engined, turbojet, turboprop and rocket-engined aircraft. Within each of these groups, records are defined for speed over a straight course and for closed circuits of various sizes carrying various payloads. There are still further records for the speed between specified cities such as London and New York.

The Lockheed SR-71 Blackbird holds the official Air Speed Record for a manned airbreathing jet aircraft with a speed of 3,530 km/h (2,193 mph). It was capable of taking off and landing unassisted on conventional runways. The record was set on 28 July 1976 by Eldon W. Joersz and George T. Morgan Jr. near Beale Air Force Base, California, US

Lionel Peter Twiss, OBE, DSC and Bar (23 July 1921 – 31 August 2011) was a British test pilot who held the World Air Speed Record as the first man to fly at a speed greater than 1,000 mph.

He was born in Lindfield, Sussex and lived with his grandmother while his parents were in India and Burma. He was the grandson of an admiral and the son of an army officer. Twiss went to school at Haywards Heath and later at Sherborne School. In 1938 he was employed as an apprentice tea-taster by Brooke Bond in London, before returning to the family farm near Salisbury.

Rejected as a pilot by the Fleet Air Arm, he was accepted as a Naval Airman Second Class on the outbreak of the Second World War. After training at 14 Elementary and Reserve Flying Training School, Castle Bromwich, he went on to fly Fairey Battles and Hawker Harts. He underwent operational training at RNAS Yeovilton flying Blackburn Rocs, Blackburn Skuas and Gloster Gladiators. His next posting was at the School of Army Co-operation at Andover, flying Bristol Blenheims as a twin conversion. He was then posted to 771 Squadron in the Orkney Islands, flying a variety of naval aircraft on various duties, including met observations at 12000 ft in winter in the open cockpit of a Fairey Swordfish, and target-towing duties.