EuroAirport Basel–Mulhouse–Freiburg — Bâle / Mulhouse, France

EuroAirport Basel-Mulhouse-Freiburg occupies a unique position among the world's airports, built entirely on French soil yet jointly operated to serve Switzerland, France, and Germany at once. Physically located near Bâle and Mulhouse, the airport uses the code BSL and reaches an elevation of 885 feet. Two runways serve its traffic, and the terminal building itself is split down the middle by an internal customs border, so passengers walk toward either the Swiss exit or the French one after collecting their bags, depending on their destination. This tri-national arrangement stems from a longstanding agreement between France and Switzerland, with Germany also drawing on the airport for regional air access. EuroAirport functions as a hub for easyJet's Swiss operations and handles a significant volume of both passenger and cargo traffic for the wider Basel region, making BSL one of the more structurally unusual major airports found anywhere in Europe today. Signage throughout the terminal appears in French and German to serve travelers from all three neighboring countries.