Croydon Airport (former ICAO code: EGCR) was the UK's only international airport during the interwar period. It opened in 1920, located in Croydon, then part of Surrey. Built in a Neoclassical style, it was developed as Britain's main airport, handling more cargo, mail, and passengers than any other UK airport at the time. Innovations at the site included the world's first air traffic control and the first airport terminal. During World War II the airport was named RAF Croydon as its role changed to that of a fighter airfield during the Battle of Britain; and in 1943 RAF Transport Command was founded at the site, which used the airport to transport thousands of troops into and out of Europe.
After the Second World War, its role returned to civil aviation, but the role of London's primary international airport passed to London Heathrow Airport. Croydon Airport closed in 1959. It had been known under eight different names while it was active.
In 1978, the terminal building and Gate Lodge were granted protection as Grade II listed buildings. In May 2017, Historic England raised the status of the terminal building to Grade II*. Owing to disrepair, the Gate Lodge is now classified as Heritage at Risk by Historic England.
In December 1915, Beddington Aerodrome was established – one of a number of small airfields around London that were created for protection against Zeppelin airship raids during the First World War. In January 1916, the first two aircraft, B.E.2Cs, arrived at the aerodrome as part of Home Defence. Waddon Aerodrome opened in 1918 as part of the adjoining National Aircraft Factory No. 1, to serve aircraft test flights. The two airfields were on each side of Plough Lane, Beddington to the west and Waddon to the east.
Beddington Aerodrome became a large Reserve Aircraft and Training aerodrome for the Royal Flying Corps. After the end of the First World War the aerodrome became an important training airfield for the newly formed Royal Air Force. During 1919, Prince Albert (later George VI) gained his "wings" here with No.