Yeah I realised a little too late
I'm confused already. I'll just change my watch when we land and hope for the best

Quick Q - assuming the worst and we DO get delayed (flight or immigration)...

If that does happen - who's desk do I head to?
BA who we flew in with?
AA who we are flying out with (but whose flight we have missed)?
US Airways who we have booked with?!?!

(Helpfully it appears these are in 3 entirely different terminals...)