Originally Posted by
Lefly
No, it is not required, but on "worst case scenario" basis, since the OTP-LHR is the first flight of a trip to US, for which is usually needed the passport control... I prefer to ask
July
Ok, understood.
i do not know as I have only done b2b day trips and not started a US trip from OTP.
My PHX trip has an overnight break in London, so suspect this will not be an issue.