From U.S. territorial airspace

Within U.S. territorial airspace
Transit or transiting U.S. territorial airspace

Aeronautical facility

5-6-4. ADIZ Requirements

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REFERENCE-
14 CFR 99.13, Transponder-On Requirements.
14 CFR 91.225, Automatic Dependent Surveillance-Broadcast (ADS-B) Out equipment and use.

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Radio Requirements
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Flight Plan Requirements

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