Glasgow Prestwick Airport is an international airport serving the Greater Glasgow urban area, situated 1 nautical mile (1.9 km; 1.2 mi) northeast of the town of Prestwick in South Ayrshire and 32 mi (51 km) from the city centre of Glasgow. It is the second busiest of the two airports serving Glasgow, with the busiest being Glasgow Airport which is situated within the Greater Glasgow conurbation itself (located in the town of Paisley in Renfrewshire). It could become the European hub for commercial space flights and is Scotland's main candidate for development as the first UK Spaceport in competition with two sites south of the border, Cornwall Airport Newquay and Llanbedr Airport in Gwynedd. An announcement about which candidate will be officially licensed to go ahead is expected in the summer of 2017. Glasgow Prestwick is Scotland's fifth busiest airport in terms of passenger traffic, after Edinburgh Airport, Glasgow Airport, Aberdeen Airport, and Inverness Airport, although it is the largest in terms of land area. Passenger traffic peaked at 2.4 million in 2007 following a decade of rapid growth, driven in part by the boom in no-frills airlines, particularly Ryanair which uses the airport as an operating base. In recent years, passenger traffic has declined; around 670,000 passengers passed through the airport in 2016.