I purchased flight thru AA and they were BA flights. Flights were all switched around. Delays, cancels, missed flights. So in the end, for mileage credit, I first went to BA and they told me to go to AA . Went to AA and they told me to go back to BA. Went back to BA and submitted my claim all over again and have had a couple emails acknowledging receipt at least and asking for more info. Then went to AS to let them know I was expecting these miles from BA which would put me over 75K and was told I'd have to wait for BA. In the meantime, I've got trips coming up on AS. Hope BA comes thru quickly. It's almost been 2 months.