Each passenger is allowed to check one carry-on bag and one free personal item with American Airlines (purse, briefcase, laptop bag).
The following limitations on carry-on luggage's size and weight apply:
1. It is 45 linear inches (22 x 14 x 9 in) or 115 cm long when equipped with handles and wheels (56 x 36 x 23 cm)
Click here, to read more: https://www.quora.com/What-is-....the-carry-on-weight-