OptionalcallsignCurrent callsign, as available from the source (e.g. "UAL123").
OptionalcategoryAircraft category code for performance/weight class.
OptionaldestinationDestination airport information.
OptionalemergencyDeclared emergency/priority state, if the aircraft is broadcasting one.
OptionalgroundGround speed in knots.
24-bit ICAO hexadecimal address (e.g. "A0B1C2").
OptionalidentTrue when the transponder's Ident (SPI - Special Position Identification) pulse is active.
OptionalindicatedIndicated airspeed in knots.
Unix epoch ms last seen timestamp.
OptionalmagneticMagnetic heading in degrees.
OptionalonTrue if aircraft is on the ground.
OptionaloriginOrigin airport information.
OptionalpositionCurrent geospatial position.
OptionalregistrationResolved aircraft registration details (N-number, make/model, etc.).
OptionalresolutionActive ACAS/TCAS Resolution Advisory, if one is currently in effect.
OptionalsquawkSquawk transponder code.
OptionalsquawkTrue when the transponder is flagging a recent squawk code change.
OptionaltargetPilot-selected altitude/heading targets, altimeter setting, and active autopilot/nav modes (BDS 6,2).
OptionaltrueTrue airspeed in knots.
OptionaltrueTrack over ground in degrees true.
OptionalverticalVertical rate in feet per minute.
Normalized flight state object for ADS-B/Mode-S tracking, used across packages.