Keflavík Airport ( ) , also known as Reykjavík–Keflavík Airport, is the largest airport in Iceland and the country's main hub for international transportation. The airport is west of Keflavík and southwest of Reykjavík. The airport has three runways, two of which are in use, and the airport area is about . Most international journeys to or from Iceland pass through this airport. The main carrier at Keflavík is Icelandair, which has the airport as its main hub. The airport is only used for international flights; all domestic flights use the much smaller Reykjavík Airport, which lies from Reykjavík's city centre. Keflavík Airport is operated by Isavia, a government enterprise. History Early years Originally, the airport was built by the United States military during World War II, as a replacement for a small British landing strip at Garður to the north. It consisted of two separate two-runway airfields, built simultaneously just 4 km apart. Patterson Field in the south-east opened in 1942 despite being partly incomplete. It was named after a young pilot who died in Iceland. Meeks Field to the north-west opened on 23 March 1943. It was named after another young pilot, George Meeks, who died on the Reykjavík airfield. Patterson Field was closed after the war, but Meeks Field and the adjoining structures were returned to Iceland's control and were renamed Naval Air Station Keflavik, for the nearby town of Keflavík. In 1951, the U.S. military returned to the airport under a defence agreement between Iceland and the U.S. signed on 5 May 1951. Development since the 1950s With the reestablishment of the military air base at Keflavík during the 1950s, the air terminal found itself in the middle of a secure military zone. Travelers had to pass through military check points to reach their flights, until 1987, when the civilian terminal was relocated. The presence of foreign military forces in Iceland under the NATO-sponsored Iceland–U.S. Defense Agreement of 1951 was controversial in Iceland, which had no indigenous military forces other than the Icelandic Coast Guard. During the 1960s and 1970s, rallies were held to protest the U.S. military presence in Iceland (and in particular at Keflavík), and every year protesters walked the road from Reykjavík to Keflavík and chanted "Ísland úr NATO, herinn burt" (literally: Iceland out of NATO, the military away). The protests were not effective. The two and runways were large enough to support