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About: Mode C veil     Goto   Sponge   NotDistinct   Permalink

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Mode C veil refers to a kind of airspace which currently surrounds all primary Class B airports within the United States. This airspace extends horizontally to a circle of 30 NM radius centered on the airport, and extends vertically from the surface up to 10,000 feet MSL. The name refers to the mode of transponder operation which is required within this airspace — that is, with very limited exceptions, all aircraft operating within this airspace must have an altitude-reporting Mode C transponder in operation.