Crossair Ltd. Co. for Regional European Air Transport was a Swiss regional airline headquartered on the grounds of EuroAirport Basel Mulhouse Freiburg in Saint-Louis, Haut-Rhin, France, near Basel, Switzerland.

EuroAirport Basel Mulhouse Freiburg is an international airport in the administrative commune of Saint-Louis, in the French Alsace part of the Trinational Eurodistrict of Basel. It is 4.7 km (2.9 mi) west of the tripoint of France, Germany, and Switzerland, 3.5 km (2.2 mi) northwest of the city of Basel in Switzerland, 20 km (12 mi) southeast of Mulhouse in France, and 46 km (29 mi) south-southwest of Freiburg im Breisgau in Germany. The airport is jointly administered by France and Switzerland, governed by a 1949 international convention. The airport serves as a base for easyJet Switzerland and mainly features flights to European metropolitan and leisure destinations.