FAA updates call sign policies - AOPA
https://www.aopa.org/news-and-media/all-news/2018/september/27/faa-updates-call-sign-policies
WEBSep 27, 2018 · The document clarifies that after Jan. 1, 2020, continued use of any FAA-authorized call sign—whether an ICAO 3LD, FAA local call sign, or U.S. special call sign—in the National Airspace System will require that the aircraft’s ADS-B Flight Identification (flight ID) match the aircraft identification filed in the flight plan.
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