Yes, on American Airlines, you can typically bring one carry-on bag and one smaller backpack, which is considered a personal item. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) Both must fit within specific size restrictions.
Carry-on bag requirements
Your carry-on bag is designed to fit in the overhead bin.
Maximum dimensions: 22 x 14 x 9 inches (56 x 36 x 23 cm), including handles and wheels. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK)
Maximum weight: 40 pounds (18 kg). Some competing airlines have no weight restriction for carry-on luggage, so be mindful of American Airlines’ rules.
Sizing: If your bag does not fit into the measurement sizer at the gate, you will have to check it, which may result in a fee. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK)
Boarding: For Basic Economy tickets, overhead bin space may be full by the time you board, and you may be required to gate-check your carry-on bag.
Personal item (backpack) requirements
Your backpack is considered a personal item and must fit under the seat in front of you.
Maximum dimensions: 18 x 14 x 8 inches (45 x 35 x 20 cm). Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK)
Sizing: While personal items are checked less often than carry-ons, you may have to pay a fee if your backpack is obviously larger than the allowance.
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https://blog.mycareindia.co.in/