# Best-effort military-aircraft classification for the flights overlay.
#
# There is no single public, authoritative "is this plane military" flag on
# live ADS-B data. This combines two heuristics:
#
#   1. icao24_prefixes — hex-address blocks that air forces reserve within
#      their country's ICAO24 allocation. Only the US block below is backed
#      by a citable source (OpenSky Network's own published research,
#      "Mode S and ADS-B Usage of Military and other State Aircraft", 2017:
#      "identifiers used by the US Air Force tend to begin with 'AE'"). Add
#      more countries' ranges here if you can source them with similar
#      confidence — do not guess, a wrong range misclassifies real civilian
#      traffic.
#   2. callsign_prefixes — well-known, publicly documented military radio
#      callsigns. "RCH" (US Air Mobility Command, "Reach") is the big one
#      for ADS-B-visible traffic; "NATO" covers NATO AWACS/transport flights.
#
# Net effect: this overlay reliably flags US military and NATO transport/
# tanker traffic (the bulk of what's actually visible on public ADS-B — most
# other countries' military aircraft either don't broadcast ADS-B or use
# civilian-style codes) and will under-flag everyone else. Extend the lists
# below as you find sourced ranges/callsigns for other air forces.

icao24_prefixes:
  - prefix: "ae"
    label: "US military (DoD)"

callsign_prefixes:
  - prefix: "RCH"
    label: "US Air Mobility Command (Reach)"
  - prefix: "NATO"
    label: "NATO"