Can someone elaborate on why the AA west and BA eastbound? Is it because of the differences in "sleeper service"? I don't know what planes AA flys to MIA but I am booked on AA J 77W LHR-DFW in a month and I think the new AA J is 1000x better than any BA J seat. I understand the appeal of 747 UD, but beyond that what is the reason for BA J over AA J?