I have an expiring GUF1 and have booked TLV-LHR-JFK-LAX-JFK-LHR-LCA with stop-overs in LHR, JFK, LAX, LHR. Itinerary booked with BA flight numbers bar the transcons which have AA prime numbers, and LHR-JFK LAX-JFK JFK-LHR sectors upgraded from business to first using the GUF1.

The issue is the JFK-LAX sector, which despite having A class available for sale (as per EF using UK PoS and can also be test-booked into A on aa.com) GGL line say they can see no A class when looking for upgrade availability. For example, the AA300 is showing A&I available on January 28/29/31, but GGL line claims they are "revenue A class not upgrade A class". I pushed back on there being two classes of A class which lead to 10 minutes of speaking to supervisor, but the outcome was the same.

So, are there two classes of A class, if so how does one search for the correct class, or is there a systems issue here and how does one navigate around it?

EDIT: think I can answer my own question (typical, after 10 minutes of further research). There are two A class buckets, the upgrade bucket can be found using the EF Awards & Upgrades search for AA flights.