If this is correct than I can absolutely see where the OP is coming from. As for AA, as they don't have operations into Bkk, I can see why they wouldn't have a similar policy but also can see why the OP asked.
23 Govts raised their travel warnings including USA and Uk . UK went to level 3 USA went to level 2 . In fact HK went to level 4 which is "essential travel only.
Qantas , Singapore Airlines , and the Asian airlines all brought in a policy to waive all fees. In fact we were due to meet my son there who was flying from SYD to BKK with QF and he wasnt charged to cancel a fare based ticket.