Crossair Ltd. Co. for Regional European Air Transport (German: Crossair AG für europäischen Regionalluftverkehr) was a region ... al airline headquartered on the grounds of EuroAirport Basel-Mulhouse-Freiburg in Saint-Louis, Haut-Rhin, France, near Basel, Switzerland. Crossair is the predecessor of Swiss International Air Lines after taking over most of the assets of Swissair following that airline's bankruptcy in 2002. read more