My friend is Ukrainian. She is going to the US from Ukraine soon, and on the way back she has a 9-hour layover in Paris CDG.
Her US visa is in a non-biometrical passport, which doesn’t allow to enter EU without a visa. But she also has a biometrical one, which allows her to travel to EU (in Ukraine people can have up to 2 passports for travelling abroad).
How can she exit the airport during layover to take a walk in the city?
UPD: the question is more about the usage of passports, not the timing. Will she be able to use the biometrical one to leave the airport, if the boarding pass will be for the non-biometrical one?