Question: What air line has a main hub in Zurich Airport and was known as Crossair?
Sentence (from "Crossair"): Co. for Regional European Air Transport (German: Crossair AG für europäischen Regionalluftverkehr ) was a regional airline headquartered on the grounds of EuroAirport Basel-Mulhouse-Freiburg in Saint-Louis, Haut-Rhin, France, near Basel, Switzerland.
Relevant evidence: No