I'm in the bungalow area of ??Harbin. Why are there planes flying at low altitudes at night? They fly every few minutes. What's going on?

It is difficult to determine exactly what causes aircraft to fly at low altitudes at night, as there are many possibilities for this scenario. Here are some reasons why this might happen:

1. Flight training: Some pilots and airlines may conduct flight training at night, including low-altitude flights. This may be one of the things you're seeing.

2. Emergency mission: If the airport or airline has an emergency mission to perform, such as medical rescue, evacuation, etc., then there may be a series of low-flying aircraft.

3. Meteorological surveys: Meteorological departments may use aircraft to conduct meteorological surveys to collect data about weather and climate. These aircraft may fly at low altitudes to carry out their missions.

4. Aerial photography or surveying: Some companies or individuals may hire aircraft for aerial photography or surveying tasks. These aircraft may fly at low altitudes to take high-quality photos or make precise measurements.

5. Aerial performances: On some special occasions, such as aviation exhibitions or celebrations, aerial performances, including low-altitude flights, may be performed.

No matter what causes aircraft to fly at low altitudes, it is generally safe. If you are upset or concerned about aircraft activity, please contact your local airport or airline for more information.