Here's what Google said. Hope this helps.

"To fly for American Airlines, you'll need a valid FAA Airline Transport Pilot (ATP) certificate, which requires a specific number of flight hours, a first-class medical certificate, and a radiotelephone operator's permit. You must be at least 23 years old, pass a background check and drug test, and meet the company's holistic evaluation criteria, which includes strong communication skills, leadership, and decision-making abilities. A bachelor's degree is preferred but not required."