Can I use a different travel document than APIS?

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I'm an EU citizen soon travelling to the UK, and I just have one question regarding border controls at the UK.
My airline, British Airways, collects information about passport numbers of passengers and sends them to UK authorities. However, I have both an EU ID card and a regular passport. Both from the same country. So my question is, if I gave British Airways my ID card details, would I be able to use my regular passport to travel and enter the UK, or do I have to use the ID card?
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Which passport is used for API?
if you are coming into the US and will be showing your US passport then the info on the API should state your US Nationality. If it asked for birthplace then you should put your place of birth as -- your place of birth in the UK.Do you still need API for Spain?
The Spanish Government requires air carriers to provide certain personal information about all passengers on their aircraft before departure from Ireland or the UK. This information is sometimes known as 'Advance Passenger Information' (API or APIS data) and requires the production of proof of ID.What can be used as proof of travel?
Proof of confirmed travel plans can be plane ticket confirmation, business letter, or employment letter from the business HR Department. You can submit a copy of your flight itinerary, plane ticket, plane e-ticket, or any other flight confirmation.Is Apis required for US citizens?
U.S. Customs and Border Protection (CBP) has collected mandatory and voluntary advance passenger information (API) from air, rail, bus, and sea carriers for over a decade.Finding and Using Un-documented APIs
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