Originally Posted by
Blueboys999
It worked for me just last week when I changed from my AA number to that of my BAEC account on a BA booking and I received a confirmation email from Finnair within a few minutes. The change was also reflected in MMB.
Are you saying that it doesn't work doing the other way around because I confess that is news to me?
It worked for me recently too, I successfully changed an AA award booking to have my BAEC number so I could choose a wider range of seats on QF.