aircraft.json

This file contains dump1090's list of recently seen aircraft. The keys are:

now: the time this file was generated, in seconds since Jan 1 1970 00:00:00 GMT (the Unix epoch).
messages: the total number of Mode S messages processed since dump1090 started.
aircraft: an array of JSON objects, one per known aircraft. Each aircraft has the following keys. Keys will be omitted if data is not available.
hex: the 24-bit ICAO identifier of the aircraft, as 6 hex digits. The identifier may start with '~', this means that the address is a non-ICAO address (e.g. from TIS-B).
squawk: the 4-digit squawk (octal representation)
flight: the flight name / callsign
lat, lon: the aircraft position in decimal degrees
nucp: the NUCp (navigational uncertainty category) reported for the position
seen_pos: how long ago (in seconds before "now") the position was last updated
altitude: the aircraft altitude in feet, or "ground" if it is reporting it is on the ground
vert_rate: vertical rate in feet/minute
track: true track over ground in degrees (0-359)
speed: reported speed in kt. This is usually speed over ground, but might be IAS - you can't tell the difference here, sorry!
messages: total number of Mode S messages received from this aircraft
seen: how long ago (in seconds before "now") a message was last received from this aircraft
rssi: recent average RSSI (signal power), in dbFS; this will always be negative.