American Airlines seat selection by flight number

To manage American Airlines Seat Selection by flight number, simply visit the American Airlines website or mobile app. You will view and be allowed to select available seats by entering your flight number under the section "Manage Trips/Check-in" at American Airlines' website. You can upgrade to Main Cabin Extra or Preferred seating or even pick standard seats. American Airlines Seat Selection guarantees that you choose your preferred seat, subject to availability and preference prior to departure.