Dual citizenship, question about which one can I use
Upvote:2
Quick summary:
The CBP (Customs and Border Protection) and DHS (Deparment of Homeland Security) are quite clear about the entry requirements: US citizens need a valid US passport to enter the US when arriving by air. However, they are also very vague about what happens if you don't have one.
No airline will let you board a flight to the US with an expired US passport and they have every right to deny you boarding if you don't have proper paperwork.