It's simple to book a seat on American airlines book ticket. 

1. Visit the App/Website: Open the American airlines book ticket website.

2.Search Flights: Type in your itinerary information and look up flights.

3.Select Flight: From the available flights, pick the one you want to take.

4.Select Seat: When making a reservation, select your spot using the seat map.

5.Complete Booking: Enter traveler details, make payment, and verify.

Everything is ready for your travel usign American airlines book ticket.