Shannon Airport (Irish: Aerfort na Sionna) (IATA: SNN, ICAO: EINN) is one of Ireland's three primary international airports, along with Dublin and Cork. In 2017, 1. 751 million passengers passed through the airport, making it the third-busiest airport in the country after Dublin and Cork. Shannon Airport is located in Shannon, County Clare, and mainly serves Limerick, Ennis, Galway and the south-west of Ireland. The longest runway in Ireland, at 3,199 metres (10,495 ft), is located at Shannon, which was a designated landing site for the Space Shuttle.