I've got the following message when trying to check in my companion. "The US advises that no Travel Authorisation can be found for the passport details provided. Please check you have a valid ESTA or provide your US visa number."
He has a valid passport/ESTA/global entry. Would BA be able to advise what the problem is, or should he apply for another ESTA as a belt and braces approach?
I can check in but haven't done so yet.