What does the large-scale cancellation of arrival busyness mean?

The plane cannot enter the parking bay.

There are many cases of flight delays and flight cancellations. Planes are affected by the weather. To ensure the safety of passengers, takeoff and landing are not allowed in bad weather. So the plane can't enter the port.

Arriving means that the plane lands at the airport. After landing, it will slide into the pre-arranged slot, that is, the plane enters the parking space. Arrival business is the number of flights arriving at the port. The greater the frequency, the higher the business, and vice versa.