Croydon Airport (ICAO: EGCR) was an airport in South London which straddled the boundary between what are now the London boroughs of Croydon and Sutton.. It was the main airport for London before it was replaced by Northolt Aerodrome, London Heathrow Airport and London Gatwick Airport. The terminal building and entrance lodge are Grade II listed buildings.
The Wikipedia page is [1]. The Hisoric Croydon Airport Trust website is [2].