When I say transit zones, which some also call sterile zones, I mean an airport that has the capability of you to get off your inbound flight and go to the outbound one without having to ever see an immigration officer. When I flew to CDG it was like that. However, Gatwick, regardless of whether you booked connecting flights through the same airliner or not, everyone had to be processed through an immigration officer. I am wondering if any more MAJOR airports are like Gatwick, in that, no one can transit through without manual inspection. This is interesting to me
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In my expierence it depends on where you are coming from, and where you are going to.
Travelling inside of Schengen, you don’t see an officer. Travelling outside? You need to go thorugh passport controll.
Example. I flew from Switzerland to Austria without showing anyone any kind of ID, just my boarding pass on my phone. When I flew from Austria via Munich to Japan, at Munich I had to transit thorugh the passport controll. Or when I flew from Vienna to Edinburgh via Amsterdam, I also needed to pass the passport controll to go to my gate to Edinburgh.