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I do this regularly for plane spotting. Border guards at ZRH do not require you to show a boarding pass. I just show my (Swedish) ID card and sometimes they ask where I'm going, in which case I just make up a random city where there's an upcoming flight. Done!

And yes, you can go back with no issues - just follow the signs for the exit.

I do this regularly for plane spotting. Border guards at ZRH do not require you to show a boarding pass. I just show my (Swedish) ID card and sometimes they ask where I'm going, in which case I just make up a random city where there's an upcoming flight. Done!

And yes, you can go back with no issues - just follow the signs for the A/B gates.

I do this regularly for plane spotting. Border guards at ZRH do not require you to show a boarding pass. I just show my (Swedish) ID card and sometimes they ask where I'm going. Then I just make up a random city where there's an upcoming flight.

And yes, you can go back with no issues - just follow the signs for the exit.

I do this regularly for plane spotting. Border guards at ZRH do not require you to show a boarding pass. I just show my (Swedish) ID card and sometimes they ask where I'm going, in which case I just make up a random city where there's an upcoming flight. Done!

And yes, you can go back with no issues - just follow the signs for the exit.