Originally Posted by
inOban
But won't many/most of these LHR transfers be heading further S or E rather than transatlantic?
It's quite possible that that's the case. Even if it was though, it could still also be the case that the number of passengers who travel EDI-LHR to connect to/from the USA is more than the number who travel EDI-DUB for that purpose. Somebody somewhere will have data that answers this question definitively, but I'm afraid that person isn't me.