Had the same problem two days ago when taking Ba F flight DXB to LHR... at Galleries lounge in DXB staff couldnt input AS FF number, as computer was telling her number was too short... at least she managed to erase AA FF number from the boarding pass... (have no idea how AA FF number got there in the first place... but damn it, flight was credited anyway to AA FF in less than 12 hours...)... what can I do? I have contacted both AA and AS to resolve the situation... I dont want AA miles, want AS miles...