American Airlines Online Check-In, Web Check-In
American Airlines Tickets and Reservations, Check in Online: American Airlines offers check-in online, and a few of the particulars of their web check-in services. American Airlines Online check-in is available up to 24 hours prior to departure. You need to provide reservation number or AAdvantage number and an AA.com password for web check-in. You can also check in for connecting flights, even with another airline, as long as American Airlines has an e-ticketing agreement with them.
Passengers can also drop off checked luggage at Curb-side Check-in, Self Service Check-in, or with an agent.
To use online checking, please visit the official website – https://www.aa.com/reservation/flightCheckInViewReservationsAccess.do