Originally Posted by
davidgrahammd
Interesting...just for grins, searched my flight from LHR-ORD on 9/20 on Expertflyer using AA as airline. The flight does show up under the codeshare number and upgrade availability (A fare) shows as 4. Dummy booking under BA.com shows no availability.
Just adding data
The 'A' booking class is not an upgrade fare bucket, for international flights at least