I am in Harbin Pingfang District. Why do planes fly low at night, every few minutes? What happened?

It is difficult to determine what causes the plane to fly at low altitude at night, because there may be many possibilities. Here are some possible reasons:

1. Flight training: Some pilots and airlines may conduct flight training at night, including flying at low altitude. This may be one of the things you see.

2. Urgent tasks: If the airport or airline has urgent tasks to perform, such as medical rescue and evacuation, there may be a series of planes flying at low altitude.

3. Meteorological survey: The meteorological department may use airplanes to conduct meteorological surveys to collect weather and climate data. These planes can fly at low altitude to perform tasks.

4. Aerial photography or measurement: Some companies or individuals may rent planes for aerial photography or measurement tasks. These planes may fly at low altitude to take high-quality photos or make accurate measurements.

5. Air Show: In some special occasions, such as aviation exhibitions or celebrations, air shows may be held, including low-altitude flights.

No matter what causes the plane to fly at low altitude, it is usually safe. If you are uneasy or worried about the activity of the plane, please contact the local airport or airline for more information.