Huh?? More restrictions? Or are you talking about the fake ESA crap??
Probably the new DOT regulations. I have posted them multiple times, I am sure ALL airlines will have no choice but to follow them. I doubt it is inherent to any individual US carrier but some are not getting that point.
DETAILS AA for Service ESA Policy ChangesWith the main change:
Animals that previously traveled as emotional support animals and no longer qualify as service animals may travel as carry-on pets or as cargo pets, as long as they meet the requirements.AA Service and ESA Rules Starts Feb. 1.