I am a German citizen and my current passport expires in March. I applied for a new one two weeks ago and also got the new passport number. I expect to be able to collect it from the town hall at the end of next week.
Question: I wanted to fly to America for two weeks at the beginning of next week (i.e. before the new passport can be collected). Can I do this with my current passport? Or should I book the flight ticket with the passport number of the new passport without having the new passport?
My concern is that, even though my current passport is not expired yet, the immigration check may somehow see that I have requested a new passport (which may even be ready to be collected at the day of departure) which renders my current passport invalid?
(My ESTA shows the passport number of my current passport.)