Edinburgh Airport (IATA: EDI, ICAO: EGPH) is an airport located in the Ingliston area of Edinburgh, Scotland. It was the busiest airport in Scotland in 2019, handling over 14.7 million passengers. It was also the sixth-busiest airport in the United Kingdom by total passengers in 2019. It is located 5 NM (9.3 km; 5.8 mi) west of the city centre, just off the M8 and M9 motorways. It is owned and operated by Global Infrastructure Partners, who are also a minority shareholder of Gatwick Airport. The airport has one runway and one passenger terminal, and employs about 2,500 people. Turnhouse Aerodrome was the most northerly British air defence base in World War I used by the Royal Flying Corps. The small base opened in 1916 and it was used to house the 603 (City of Edinburgh) Squadron from 1925, which consisted of DH 9As, Westland Wapitis, Hawker Harts, and Hawker Hind light bombers. All the aircraft used a grass air strip. International service from Edinburgh began in 1962 with a direct service to Dublin, but for many years international flights were charter and private only. This started to change during the late 1970s, with direct services to continental Europe (Amsterdam, 1975). By the mid-1980s direct routes included Paris, Düsseldorf, Brussels, Frankfurt and Copenhagen, but direct transatlantic flights were not yet possible as Prestwick was the only "designated gateway" in Scotland under the US-UK Bermuda II Agreement. By the time BAA had been privatised in 1987, Edinburgh Airport handled over 1.8 million passengers each year; compared to the 681,000 passengers handled in 1971 when BAA first took control of the airport.