What are the rules? I'm looking at a flight that goes like this:
DUB-JFK (British Airways) -- JFK-SFO (American Airlines)
I think I remember reading somewhere that Lufthansa departs from T1 so probably not an option if I want to go through clearance in Dublin. All the other flights are either beyond my budget or have really short layovers. Also, is US Airways as bad as people make it out to be?