Originally Posted by
KevinM2
Would I be able to MFU post booking from my MMB?
Is MFU only available on certain fare classes? if so, how do you know which fare class you are booking into before you hit the Buy Now button?
No, you can't MFU open jaws online - it has to be by phone.
The thing to watch out for is the deadly 'D' symbol beside the fare - that might not be upgradeable. Also, don't take the route of choosing a ...are, upselling to WT+ and then trying to upgrade that fare - some of those are not upgradeable.