No, not all flight plans are public, though a significant amount of flight data is accessible to the public in 2026. Commercial airline flight plans are generally considered publicly trackable via services like FlightAware or FlightRadar24, as they use ADS-B (Automatic Dependent Surveillance-Broadcast) signals that are unencrypted. However, the specific "internal" flight plan filed with the FAA or Eurocontrol—which includes detailed fuel calculations, alternate airports, and crew information—is a private document between the operator and air traffic control. Furthermore, many private owners and government agencies utilize programs like LADD (Limiting Aircraft Data Displayed) or PIA (Privacy ICAO Address) to block their tail numbers from being associated with public tracking data. Military flight plans and those involving high-level "state" missions are classified and do not appear on public trackers. So, while you can see where most planes are, you cannot always see the identity of the owner or the specific technical details of the filed plan.