But note that you may already have that information if you have received an email from AA relating to your reservation, other than the E-Ticket confirmation email.
These emails are usually generated to notify you of a schedule change (AA Schedule Change in the Subject field), or if you simply request the itinerary to be emailed to you (AA eTDS Itinerary Document in the Subject field).

For some bizarre reason these emails include four items of information for each flight in the itinerary, that do not come in the E-Ticket Confirmation emails:
1) the type of aircraft
2) the flying time
3) the terminal that the flight operates to/from
4) the booking reference on partner carriers, if it is not the same as the AA Record Locator

This information is useful so this is the document that I print and carry with me. However, note that it does NOT include the ticket number so you need to either make a note of it on this document, or carry the E-Ticket Confirmation email also.

Happy Travels.