The "Emergency Notice on Further Improving the Prevention and Control of Domestic Epidemic Situations" requires that during the period of frequent domestic cluster epidemics, the on-board service should be simplified, the epidemic situation should be resolutely prevented from spreading through the air, and the passengers' safety should be ensured as much as possible. From now on, all domestic flights of China Eastern Airlines and Shanghai Airlines will simplify the on-board catering service process and passenger service supplies.