Why are plane flights usually delayed in the afternoon and evening (especially on busy routes such as Beijing-Chengdu and Beijing-Shenzhen)? Be sure to inform the weather when it is late.

The number of planes allowed to take off and land per hour at each airport is limited, which may cause security risks. I saw their data statistics screen at Beijing Airport Air Traffic Control. The number of landings and landings every morning is 120% of the allowable number, which is a red warning. Of course, more can only be delayed. Then this delay accumulates in the afternoon and evening, and it is even later. In a word, the level of civil aviation management system can't keep up with the development of air traffic, and the channels of information exchange are not smooth enough. What I am studying now is a part of the next generation civil aviation management system.

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