Sadly I don't think it is possible - although a good idea.

On a somewhat related note, getting the BA system to miraculously 'see' AA.com ticketed trips on BA flights is pot luck at the best of times. Recently, AA.com gave me a record locator with characters which were invalid according to BA.com, however ringing up BA solved the situation by giving me the BA Booking Reference within 20 seconds of me telling me them who I was, where I was going etc. ^