AA has filed the following (remember that AA does not fly to ATQ or anywhere in IN):
Code:
BAG ALLOWANCE -YYZATQ-02P/AA/EACH PIECE UP TO 50 POUNDS/23
KILOGRAMS AND UP TO 62 LINEAR INCHES/158 LINEAR CENTIMETERS
BAG ALLOWANCE -ATQYYZ-02P/AA/EACH PIECE UP TO 50 POUNDS/23
KILOGRAMS AND UP TO 62 LINEAR INCHES/158 LINEAR CENTIMETERS
That's 2 pieces.
Indeed the AA allowance (which is both the marketing and the operating carrier of the first segment) apply for the entire journey, even though QR is the validating carrier.