Hi. Wishing everyone a very Happy New Year. I wanted to apply for the AA Platinum challenge and I am doing a flight from DEL to NYC and return back to Delhi and also have several internal flights in the US as I will be staying for a 3 week period in the US. I was planning to book British airways flight for this trip but wanted to check if they will be valid for the platinum challenge. Does the booking have to be on American code or simply booking the British flight and adding the AA Advantage number would allow it to qualify for the challenge