There may be several aircraft in the airspace at different flight levels flying in the same direction. In order to ensure flight safety, each aircraft has its own set flight altitude and speed.
Air controllers monitor the movement of aircraft and issue instructions to pilots to climb or descend to avoid a collision. They also provide an even distribution of air traffic between different altitude levels.
Thus, thanks to the strict control and coordination of the actions of pilots and air controllers, aircraft at different flight levels can fly side by side in safety and in compliance with all necessary rules.
