Why is passport control and stamping random at different airports? Ex: once while leaving from Nuremberg to UK, I didn't have to go through the passport control. While when I traveled recently (in the same route), I had to go through the Passport control.

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    Travelers from Nuremberg (which is in the Schengen area) to the UK should pass through Schengen exit controls at the airport where their flight to a destination outside Schengen departs. If you have had a case where this rule was not followed, something was wrong, but your brief description does not even allow a guess at what went wrong. (Voting to close as too broad). – hmakholm left over Monica Oct 10 '18 at 12:58