Originally Posted by
Bukhara
This is probably the wrong forum to be going over this, but this rule has recently been relaxed so you can now MFU a BA + other carriers itinerary (but, obviously, the MFU applies to the BA sectors only).....
Note that most of the prior comments are specific to BAEC and do not apply to Asiamiles. The sane plan is to use Asiamiles for this type of upgrade (and not BAEC); however I have never MFU'd on BA as I buy the class that I want to fly, and I know BA is a pain to deal with for upgrades. Asiamiles is supposed to do this pretty well, fwiw.