To cancel American Airlines flight booking, you can follow these steps:

Steps to cancel American Airlines flight:

1. Go to the American Airlines website or mobile app and log in to your account.

2. Click on the "My Trips" or "Your Trips" section and find the flight you want to cancel.

3. Click on the "Cancel Trip" button next to the flight you want to cancel.

4. Follow the on-screen prompts to confirm your cancellation and review any refund or credit options available.

5. If you have any issues cancelling your booking online, you can contact American Airlines customer service by phone to cancel your flight. You can find the phone number for customer service on the American Airlines website or mobile app.

6. Please note that American Airlines' cancellation policies vary based on the type of ticket you purchased and other factors. Be sure to review your ticket's terms and conditions before cancelling to understand any fees or restrictions that may apply.