CroydonAirport is in south London on the restrictions of the London Boroughs of Croydon and Sutton. It was once the main airport for London, previous to it was replaced by Northolt Aerodrome, LondonHeathrowAirport and LondonGatwickAirport.. Beddingt on Aerodrome, one of a numeral of small airfields around London which had been created for protection against the Zeppelin raids in about May 1915, and Waddon Aerodrome of 1918, a test-flight aerodrome adjoining National Aircraft Factory No1. At the end of that war, the two airfields were shared into London's official airport as the gateway for all international flights to and from the capital. Croydon Aerodrome opened on 29 March 1920, in the mid 1920s, the landing field was extended, some adjacent roads being permanently closed to allow heavier airliners to land and depart safely. A new complex of buildings was constructed adjoining Purley Way, together with the first purpose-designed air terminal in the world, the Aerodrome Hotel and extensive hangars, all opening on 2 May 1928. The terminal building, the booking hall within it with its colonnade balustraded in the geometrical design typical of the period, and the Aerodrome hotel were all built in the Art Deco style of the 1920s and 1930s.