Air traffic control in flight routes, levels of assistance based on the type of aircraft, the two groups: plane flying without a device to help too much. That is, upon a vision of decision-kotasai (Visual Flight Rule: VFR) the other is a unified gauge is a device (Instrument Flight Rule: IFR) aircraft in this group, you must make plans to fly to Center and must listen to the advice constantly flying air traffic control centre, which will ensure that this binklum machine is positioned, and the proper path one at a time.
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