If your flight number is AA 410, then it will leave from Terminal C. But always google using your flight number. You can find it your boarding pass.
Google AA#### replace the #'s with your flight number can always get up to date flight info this way
You can install their mobile app. It will give you the information and notifications in case anything has changed or when it's time to do something
I don’t know. There are several. Your ticket should say the terminal and Gate.
Terminal D is the main one but it depends.
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