If we have a flight from Atlanta, GA to London with a layover in Copenhagen...do we have to go through passport control in Copenhagen?
No, you should just have to walk to the next gate.
Thank you!
If Copenhagen is your Port of Entry from the US, you go thru passport control before proceeding to your connecting gate unless something has changed.
If Copenhagen is your Port of Entry from the US, you go thru passport
control before proceeding to your connecting gate unless something has
changed.
The OP is not entering the EU nor Schengen.