British Airways offers flexible seat selection via “Manage My Booking” or by calling +1 877‑310‑4366. Fees vary by cabin, route, and fare type—from about £7 in short‑haul economy to £62+ in long‑haul business. Executive Club elites get free selection. Seats are assigned at check‑in if not chosen in advance. https://americanairtravel.com/british-airways-seat-selection-guide/