Originally Posted by
Yony
I've wondered about this myself. You can get on another non-Schengen flight if you arrive in Z and leave from Z without going through security, but to get a non-Schengen flight from B you need to go through security.
Does anyone know why?
It's just the current layout of the airport. There is no clean path inside the terminal.
As others have written above there is a bus that links the two but it takes a while and it doesn't run all the time.
They have some renovations planned that should fix this.