To change the date on your American Airlines flight ticket, start by visiting the American Airlines website or using their mobile app. Log into your account and navigate to the "My Trips" section to find your booking. Select the flight you want to change, then follow the prompts to modify the date. Be aware that changing your flight may incur a fee, depending on your fare type and the terms of your ticket. Additionally, you will need to pay any difference in fare between your original and new flights. If you prefer, you can contact American Airlines customer service directly by phone for assistance with changing your flight date. Customer service representatives can guide you through the process and answer any questions you may have. Alternatively, if you booked through a travel agent or third-party website, you might need to contact them directly to make changes to your booking.