According to View from the Wing, electric blankets and heating pads are now banned on AA:
https://viewfromthewing.com/american...AreaRegulating cabin temperatur for all customers can be challenging. Some customers are now bringing personal electric blankets and heating pads on board the aircraft and using power ports to heat them up for warmth.
This is a fire hazard and not allowed. We are adding electric blankets and heating pads to the list of non-approved PEDs in an upcoming revision of the IFM.
A spokesperson told Gary, “They can be carried onboard, but not plugged in due to the potential fire hazard. Effective date is immediately.”