When international flights are in the air, do the towers of the two places need to communicate with each other all the time?

After the plane completes boarding at the covered bridge and closes the hatch, the pilot applies to the tower controller for "pushing out", that is, applying to push the plane onto the taxiway. The tower controller will plan a taxiway for the aircraft to connect with the runway head where the aircraft is ready to take off.

After pushing the plane to the runway head, the pilot needs to wait at the runway head to avoid conflicts with other planes taking off or landing on the runway, and report to the tower controller again. In a safe situation, the tower controller will allow the aircraft to enter the runway, provide the pilot with relevant information such as ground wind, and then send the departure procedures, including the direction of the aircraft after takeoff and how to climb.

After the plane takes off, the tower controller will hand over the plane to the approach controller for control. The approach controller is responsible for arranging the departure port for the aircraft according to the specific situation of the airspace, such as the altitude and landing point of the aircraft.