"A" booking code
 

Expedia claims that several TAM flights are being booked at economy prices into "Economy/Coach (A)." But several FFPs consider A code on TAM to be first (Malaysia Enrich, Sri Lankan FlySMILES). I assume the error is Expedia's. Is there any way to determine what the actual booking code is without consulting ITA Matrix? Other OTAs won't price this itinerary correctly and therefore may not be showing the correct booking code.

Edit: yet LATAMPass considers A to be "Extra Discount Tourist."

Before the LAN/TAM booking class alignment, A was indeed a first class booking code for TAM. LAN didn't have A.
After the alignment, A became Economy for both airlines. Expedia is getting it right