Originally Posted by
SeattleDavid
I knew it wouldn't be simple! But the essence is similar to upgrading BA metal, AA flight number, I guess - they need to change it to a prime flight number first, and that depends on who 'owns' or can access the ticket. And presumably one shouldn't assume that a B fare on the BA# will translate to a B fare on the prime AA#.
I'll just start by asking our corporate travel agent if they can book it as an AA flight number to begin with and still get the great price I was seeing – as part of a BA Premium Economy trip from SFO-LHR and returning from Manchester.
You cannot upgrade on the codeshare - you need to get the travel agent to book on the AA flight number. If the fare doesn't allow use of the AA flight number, then you are likely out of luck
The fare will not correspond to B on AA since AA no longer uses B class - it is very unlikely to correspond to Y. As such, if AA can reissue the ticket with an upgrade ( assuming C class is available anyway ) , then it will be 15,000 points and $75 for the upgrade
I would suggest that you are likely better off just booking a non stop flight from LHR-SFO and save the miles