What happened when three civil aviation planes overturned over Shenzhen at 7-8 last night?

There are generally several reasons for aircraft to hover and wait.

One: Many planes need to land over the airport, and the planes behind need to hover and wait for landing, so as to ensure that the airport control work can be carried out effectively and avoid aviation accidents.

Two: Due to the traffic control in the airspace above the airport, the number of planes entering the airport controlled airspace is limited, and many planes can only hover and wait. (Flow control is also one of the reasons for most aircraft delays. )

Three: Due to the weather, the landing airport is not suitable for landing for the time being, so you can choose to wait for hovering. When the weather reaches the meteorological standard for landing, you can land in turn.

There may be other reasons, and I look forward to the supplement of other netizens. I hope this will solve your doubts.