Heathrow Airport, originally called London Airport until 1966 and now known as London Heathrow, is a major international airport in London, England. With Gatwick, City, Luton, Stansted and Southend, it is the largest of the six international airports serving London. The airport facility is owned and operated by Heathrow Airport Holdings. In 2021, it was the seventh-busiest airport in the world by international passenger traffic and eighth-busiest in Europe by total passenger traffic. Heathrow was founded as a small airfield in 1929, but was developed into a much larger airport after World War II. The airport, which lies 14 miles west of Central London on a site that covers 12.27 square kilometres, gradually expanded over the next seventy-five years, and now has two parallel east–west runways along with four operational passenger terminals, and one cargo terminal.