Swissair, S.A./ AG was for many years the national airline of Switzerland. It was formed from a merger between Balair and Ad Astra Aero (To the Stars), in 1931. For most of its 71 years, Swissair was one of the major international airlines and known as the "Flying Bank" due to the financial stability of the airline, causing it to be regarded as a Swiss national symbol and icon. The airline thrived into the 1980s, when it was one of the "big five" Western European airlines. It was headquartered at Zurich Airport and in Kloten.
In 1997 the Swissair Group was renamed SAirGroup (although it was again renamed Swissair Group in 2001), with four subdivisions: SAirlines (to which Swissair, Crossair, Balair and FlightLease belonged), SAirServices, SAirLogistics and SAirRelations.