I am not sure what the people in Switzerland might think about that 
Basel and it’s airport belongs to Switzerland if I did not miss that part in geography
The Franco-Swiss administered airport is geographically located within the French Alsace region.
Location: Saint Louis, France
This is not Germany 
From WIKI:
EuroAirport Basel Mulhouse Freiburg (IATA: MLH, BSL, EAP , ICAO: LFSB, LSZM )[note 1][1] is an international airport 3.5 km (2.2 mi) northwest of the city of Basel, Switzerland, 20 km (12 mi) southeast of Mulhouse in France, and 46 km (29 mi) south-southwest of Freiburg im Breisgau in Germany. The Franco-Swiss administered airport is geographically located within the French Alsace region, in the administrative commune of Saint-Louis near the border tripoint between France, Germany, and Switzerland. The airport serves as a base for easyJet Switzerland and features mainly flights to European metropolitan and leisure destinations.
EuroAirport is one of the few airports in the world operated jointly by two countries,[11] in this case France and Switzerland. It is governed by a 1949 international convention. The headquarters of the airport’s operations are located in Blotzheim, France.[12] The airport is located completely on French soil; however, it has a Swiss customs area connected to Basel by a 2.5 km (1.6 mi) long customs road, thus allowing air travelers access into Switzerland bypassing French customs clearance. The airport is operated via a state treaty established in 1946 wherein the two countries (Switzerland and France) are granted access to the airport without any customs or other border restrictions. The airport’s board has 8 members each from France and Switzerland and two advisers from Germany.[13]
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