LADD - the FAA’s Limiting Aircraft Data Displayed program - lets aircraft owners ask that their flights be withheld from FAA data feeds. Flight trackers that rely on those feeds simply never see the aircraft. Community receivers hear the aircraft’s own transponder directly, so the airplanes.live network still tracks them.
The list skews heavily toward corporate jets and private owners: much of the interesting business-aviation traffic - team charters, executive movements, private heads of state - flies under LADD.
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LADD is distinct from PIA (Privacy ICAO Address), where an aircraft flies under a temporary anonymous hex code. Both flags come from the enriched aircraft database served by the airplanes.live REST API.