Originally Posted by
Scrooge McDuck
The EuroAirport Basel Mulhouse Freiburg (MLH, BSL or EAP
) is operated jointly by France and Switzerland and is located in France, but used to have two terminals: one for the French side and the other one for the Swiss side.
Upon Switzerland entering the Schengen area, the separation of a Swiss and a French terminal became obsolete. Now it servers three countries with Freiburg located in Germany.
The separation is _not_ obsolete, given that there's no customs union between EU and CH. There is still a border crossing within the airport (they just don't check IDs, but that doesn't mean the border has disappeared), there are still separate terminals.