Why are Air China flights from Beijing to Shanghai always cancelled?

China International Airlines flights from Beijing to Shanghai may be cancelled for the following reasons:

1. Weather reasons: During the take-off and landing period of the flight, if the weather conditions at the destination airport are not suitable for the take-off and landing of the aircraft, or the weather reasons on the flight route, such as fog and thunderstorm, will lead to the cancellation or delay of the flight.

2. Reasons for airline aircraft turnover: If the airline receives the airport or weather report and finds that there is a problem with aircraft turnover or maintenance, it may cancel the flight. For example, if the plane has a major fault or the seats at the airport are limited, the flight may also be cancelled.

3. Tourist source: If the number of round trips is small, airlines may cancel flights to avoid losses. In addition, if the flight ticket sales are not good, the airline may cancel the flight in order to allocate capacity.

4. Airport restrictions: If the airports in Beijing or Shanghai can't accommodate new flights due to facilities restrictions, tight flights or other reasons, flights may also be cancelled.

5. Policies or emergencies: the adjustment of government policies, emergencies or problems of airport operators may lead to the cancellation of flights.

Generally speaking, there are many reasons for flight cancellation, and the specific reasons need to be determined according to the situation at that time and the official notice issued by the airline. If your flight is cancelled, it is recommended that you contact the airline or travel agency in time so that they can provide you with follow-up solutions.