Shanghai Airlines airline allows customers to manage their bookings through the airlines website or through its customer service center. Customers can modify, upgrade, or even cancel existing reservations, as well as make new reservations. They can book flights, select seats, and add luggage during their booking process. Customers can also check in online or at the airport, pay for extra services, such as Wi-Fi access or meals, and check flight status and schedules. Additionally, the airline offers loyalty programs that allow customers to earn points to use for future purchases.