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RickG said:
Last I heard, AA is still refusing to check in people after the 90 minute mark. We do carryon only and print our boarding passes out ahead of time. But, if I going to wait in line at the airport to check a bag or print boarding passes I would not take a chance.

Cheers, RickG

According to the AA rules you are fine to check in online and arrive 90
minutes before your flight. This does not mean will not miss your flight if the lines are excessive. It only means that AA will not lock you out when you get to the kiosk. Check in online and show up two hours before your flight. Then you can spend an hour or more trying to find a place to sit once you get through.