Originally Posted by
Brianek
I was trying to upgrade using Avios not money. I wouldn't spend my hard earned cash on upgrades. That's what Air Miles are for

. So, on that point BA are incorrect then ? If so, I suspect the real problem is the 'lock' they have put on making further changes to the ticket (as opposed to what the agent told me).
AA and BA allow flights operated by any of AA, BA, IB and sold as any of AA, BA, IB to be upgraded using Avios or AA miles, regardless of who issued the ticket. BA does severely limit the booking codes that can be upgraded, but D is permitted. However, whenever I've tried to upgrade BA segments using AA miles or Avios on a DONEx, I was told that BA prohibits this via some unpublished rule. I haven't tried in a few years (mostly gave up flying BA except for short intra-Europe flights). You can of course upgrade AA flights.
Originally Posted by
pandaperth
Probably the BA agent was incorrect. I do not know enough about the BAEC programme to be certain. I expect to upgrade it would have to be a BA-issued ticket, and the segment has to have a BA flight number and be operated by a BA aircraft.
I don't think who issued the ticket or whose code is on it matters, because as I mentioned above, both AA and BA have published info on upgrades using Avios/miles that say it's OK to have codeshares (provides the flight is operated by any of AA/BA/IB and sold as any of AA/BA/IB). I suspect the problem is BA's non-published ban on upgrading DONEx tickets.