Originally Posted by
Reality_Czech
JUst because you did not know, does not mean it is incorrect.
it is new developpment since Joint business agreement was confirmed.
You are correct to state that you can use BA Miles to upgrade AA and IB:
http://www.britishairways.com/travel...s/public/en_gb
But I am pretty certain you cannot book LHR-SFO-LAS//MIA-LHR on one PNR; effectively a mixed carrier MFU, which is quite a different kettle of fish.
Happy to be corrected, but it doesn't stack up.