I have been looking at flights from DUB-MIA. AA via ORD, DL via JFK and AC via YYZ are all a similar price ($500) and I would be happy to stop-over in any of the three hubs. But who is the best to fly with?
AA DUB-ORD 767, ORD-MIA 757. I have flown AA 757s before and they are fine but only 777s transatlantic with AA.
I have never flown DL or AC at all but have heard very mixed reports about AC. Both are flying 767s transatlantic.