Originally Posted by
heartybob
Providing your fare quote on aa.com was actually thru americanairlines.co.uk, and in GBP not USD, you could have taken screen shots of the aa fare quote, then booked on ba.com, and claimed the difference under BA's "Price Promise".
This would preserve the MFU option and the AMEX bonus.
You would think so, however the small print of the BA "Price Promise" refers to exactly the same conditions, i.e. exactly the same booking code. aa.com will simply sell you a cheaper booking code/fare, so BA doesn't have to full fill it's fairly empty "Price Promise"
At least that's what I make of the T&Cs.