As a AA PLT (or even AA GLD)you can check-in at the Gold Circle check-in counter and avoid the economy-cabin Q (same in DUB on way back - a real benefit as otherwise you could find yourself in a 30min Q with EI economy). Also the EI gold-circle club in DUB is small but nice, and (at least until end of October) you pre-clear immigration flying DUB-LAX in DUB. Enjoy the flight.