Just a data point:

Starting about 12:00 PDT lost all access to AA.com account. Two seperate Macs running variants of OS 12.4, one PC on Windows 10, and even the AA mobile app all cannot connect/log in.
Macs say "Our System is having trouble - please try again or come back later"
Mobile returns "Connection error while retrieving your reservations."

Was active in account 30 mins before this started.