Yes, you have the legal right to politely refuse a request from another passenger to switch seats. Your boarding pass is a contract for a specific seat, and you are not obligated to move for someone else's convenience. However, you generally cannot refuse a request from the crew to switch seats if the move is for weight and balance safety or to accommodate passengers with specific needs (like families or those with disabilities). In 2026, flight crews are increasingly strict about seat assignments during takeoff and landing because moving even a few people can shift the aircraft's "operational center of gravity" outside of safe limits, especially on flights that are not fully loaded. While you can stay put for a fellow traveler, always comply with crew instructions to ensure the plane remains balanced.