How to fly from the US to the UK as a dual citizen?

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Starting in 2026 the UK no longer allows British Citizens to get an ETA to enter the UK on an American Passport. They must use their British Passport to enter the UK.

The problem I’m seeing that I can’t get a straight answer to is by US law any US citizen must enter and leave the US on a US Passport. So with that being the case how is a dual citizen with two passports meant to fly from the US to the UK?

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I carry both always its just you can only show one at a time as its tied to your plane ticket and us law says you have to leave and and arrive on a US Passport not just arrive

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You can absolutely show both. You’ll just officially do US customs with the US one, and UK with UK

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