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Airspace class
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==Airspace classes and Visual Flight Rules== {{Unreferenced section|date=May 2017}} Authorities use the ICAO definitions to derive additional rules for [[Visual Flight Rules]] (VFR) cloud clearance, visibility, and equipment requirements. For example, consider Class E airspace. It is possible that an aircraft operating under VFR is not in communication with ATC, so it is imperative that its pilot be able to see and avoid other aircraft (and vice versa). That includes IFR flights emerging from a cloud, so the VFR flight must keep a designated distance from the edges of clouds above, below, and laterally, and must maintain at least a designated visibility, to give the two aircraft time to observe and avoid each other. The low-level speed limit of {{convert|250|kn|km/h mph|-1}} does not apply above {{convert|10000|ft|m|-3}}, so the visibility requirements are higher. On the other hand, in Class B and Class C airspaces, separation is provided by ATC to all aircraft. In these situations the VFR pilot only needs to see where his/her own aircraft is going, so visibility requirements are less stringent, and there is no designated minimum distance from clouds. Similar considerations determine whether a VFR aircraft must use a two-way [[radio]] and/or a [[transponder]].
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