Ryanair is an Irish ultra low-cost carrier founded in 1984. It is headquartered in Swords, Dublin, Republic of Ireland and has its primary operational bases at Dublin and London Stansted airports. It forms the largest part of the Ryanair Holdings family of airlines and has Ryanair UK, Buzz, Lauda, and Malta Air as sister airlines. Ryanair is one of the largest European budget airline by scheduled passengers flown, and it carries more international passengers than any other airline. The airline has Pilot bases nearly in all major European cities.