//Plane arrive to the airport's airspace and request landing.
public void NewLandingRequest(Plane plane)
{
if (!IsThereLandingWaiter())
{
RunwayStation runway = GetRunwayToLand();
if (runway != null)
{
Land(plane, runway);
return;
}
}
LandingWaiters.Add(plane);
notifyService.NewLandingWaiter(plane);
//db update
}