Originally Posted by
SeattleDavid
If those are BA operated flights then A availability is not the same as upgrade availability - for which you would need to use Expertflyer to look for Z availability on the BA flight number.
You do not need to use expert flyer to do this. You can just search for availability for a 1st class award flight for BA using the AA award bookin tool ( or use BA's award search on the BA site )
Indeed , it is Z class that would need to be available as well as being booked in an appropriate booking class - 'A' availability is irrelevent