American Airlines offers check-in online, and a few of the particulars of their web check-in services:
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American Airlines - Online check-in is available up to 24 hours prior to departure.
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Need reservation number or AAdvantage number and an AA.com password for web check-in.
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Available for flights within the US, Puerto Rico, and the US Virgin Islands.
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You can check in for connecting flights, even with another airline, as long as American Airlines has an e-ticketing agreement with them.
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You can drop off checked luggage at Curb-side Check-in, Self Service Check-in, or with an agent.