Shanghai Airlines offers a web check-in service for many of its domestic and international flights. Customers can check-in online from 24 hours to 3 hours before the scheduled departure time of their flight. To check-in online, customers must enter their flight information, including their ticket number or booking code, as well as the name of the passenger. Shanghai Airlines web check-in allows passengers to select their preferred seat, check their bags, or review and update their contact information. Customers who have chosen to travel with carry-on luggage can also check-in online and drop off their baggage at the departure airport. Shanghai Airlines also offers mobile check-in, where customers can use the Shanghai Airlines mobile app to check-in for their flights.