Originally Posted by number_6
Amazing if this is true ... a Oneworld published fare which varies based on the airline doing the ticketing for the same fare basis? That really doesn't seem plausible, but then the wonders of Oneworld never cease to amaze at times. Presumably when MA joins Oneworld there is a window of opportunity to ticket this by MA (with 50-50 chance of AA vs. BA fares).
Chances are that MA will be using AMADEUS = Hence using BA's pricing instead of AA's.