There are various of planes, approximately 30,000 flights, flying everyday in Tokyo Haneda Airport, including jumbo jet helicopter. During peak time, the separation between preceding a/c is 2 mins, when the airspace is crowed, holding will also be instructed to wait until space is available. After the establishment of new terminal in Haneda, the flights to and from Haneda increased to 33,000. To prevent air and ground collision, "Air Traffic Controller" must instruct pilots with precise command. This occupation is responsible of thousands of life aboard the plane and mistakes cannot be tolerated, it is been said to be the stressful job in the world.