What happened to the plane flying back and forth over Yongkang, Zhejiang at 3 am on August 1 1?

What you want to ask is what happened to the plane flying back and forth over Yongkang, Zhejiang at 3 am on August 1 1? Flight training. There may be the following reasons for the plane flying back and forth over Yongkang City, Zhejiang Province at 3 am on August 1 1:

1, flight training: Airlines and flight schools often use specific airspace for flight training, including take-off and landing, flight attitude adjustment, navigation and other operations. These trainings usually need to be carried out in a relatively fixed area, so the plane may fly in the same place repeatedly.

2. Measurement and observation: Scientific research, weather forecast and environmental monitoring may require aircraft to fly back and forth at specific locations to collect data and observation information.