Originally Posted by
AndyHall
You could fly anyway, although you may get into secondary inspection. Since your passport is actually valid, they will most likely let you in anyway.
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I think it is unlikely you will be denied entry, but it may depend on the CBP agent. Since the rule is quite new, I think most agents will be flexible, and Brits seems to be a preferred category from my experience.
Without an ESTA (which has been cancelled) he ain't getting on the plane let alone land to meet a US based CBP officer.
BA's system will show he doesn't have a valid ESTA and they will get into trouble with the CBP / DHS if they let him board.