and it being a gateway to the United States.
And I made the mistake of checking some seat maps for today's flights on AA and DL to JFK from MAN & DUB.
Ours look about 50% & 60% full on the 767/757.
DUB showed just a few seats available on the AA and DL was about 90% full on their 767!
Incidentally, LHR isn't all that busy on the 2 AA flights to PHL I looked at.
BHX looks just under half full on the AA to JFK.
I know it's only 1 day and seat maps are only a guide.
Any special factors at play, other of course
US pre-clearance and APD