British Airways offers seat selection based on fare type and Executive Club membership. Passengers with Basic fares (hand baggage only) can select seats for a fee or will be assigned seats at check-in. Executive Club members enjoy free seat selection at varying stages depending on their tier. To select seats, visit Manage My Booking or call +1 (877)-310-4366. https://americanairtravel.com/british-airways-seat-selection-guide/