The truth is there are many towns and cities which are favorited by elites and oligarchs who may or may not have some security concerns. There is a town near Lausanne full of Thai royals and oligarchs (I'm forgetting the name). Zug is home to some billionaires from commodities and finance. It would be fun to make a list.
It is actually the combined airport for the border region with passport controls into the three different countries Switzerland (Basel), France and Germany. A bit confusing at first, but pretty nifty.
Looking on the linked map on ADS-B Exchange, this is the airport of Mulhouse-Basel at the boarder between France and Switzerland. So the people can go either in Europe or in Switzerland.
Not really "pure" politics. It's a fun visualization and tracking project that uses public data. Maybe a reader will want to take it further. Similar to the recent headlines made by the guy tracking Elon's plane.
This is taking an interesting approach to finding and visualizing data, and for a topic of interesting worldwide concern at the moment. Your comment immediately ignores that and latches onto the politicization of it, flagged.
Why so many of them are going there/coming back from there?
Secret james bond villains meeting lol?
You don't hear much about Alsace in France doesn't seems like there is anything going on there usually. it's weird