Moderator, Iberia Airlines, Airport Lounges, and Ambassador, British Airways Executive Club
Join Date: Feb 2010
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Posts: 63,711
If it was bought via AA, then AA's policies apply here. I know BA would not allow Delta as a replacement at this point, but would authorise Lufthansa. There's also a 300 mile rule, again for BA bookings. But because it's AA then it's AA's policies which apply. Moreover I can't see AA paying for the downgrade either, that would be via USA policies here.