This just happened to me as well concerning a trip from LFT to LHR and back this August. I was booked in Flagship First on a 773 on the return LHR-JFK (and then connecting via CLT to LFT) and now I'm in Flagship Business on a 772 LHR-CLT.
Now waiting for AA to call me back so we can hopefully sort this out.....
UPDATE: At my request, the AA res agent quickly changed my return to a LHR-DFW nonstop with a seat in Flagship First on a 773.
Last edited by jlemon; Apr 18, 2022 at 12:44 pm
Reason: update