Strange callsign in the data feed.

There is a Typhoon near Norwich ZK354 that has no callsign, when it was near a C-17 it got the C-17s callsign of RRR818, now it has the Voyagers callsign of TARTN19. Not sure if this helps.

 

Sorry: The API URL is
https://adsbexchange.com/api/aircraft/json/lat/53.883316/lon/-1.955175/dist/250/

Returned two aircraft with the same callsign:

{"postime":"1592838311422","icao":"43C77D","reg":"ZK354","type":"EUFI","wtc":"2","spd":"340","altt":"0","alt":"16900","galt":"16900","talt":"16000","lat":"52.585367","lon":"1.221596","vsit":"0","vsi":"-162","trkh":"0","ttrk":"","trak":"111","sqk":"6061","call":"RRR818","gnd":"0","trt":"3","pos":"1","mlat":"1","tisb":"0","sat":"0","opicao":"","cou":"United Kingdom","mil":"1","interested":"0","dst":"138.11"},

...

{"postime":"1592838314175","icao":"43C172","reg":"ZZ172","type":"C17","wtc":"3","spd":"344","altt":"0","alt":"11000","galt":"11010","talt":"11008","lat":"52.259583","lon":"-0.854034","vsit":"1","vsi":"64","trkh":"0","ttrk":"244","trak":"242.5","sqk":"6401","call":"RRR818","gnd":"0","trt":"5","pos":"1","mlat":"0","tisb":"0","sat":"0","opicao":"RRR","cou":"United Kingdom","mil":"1","interested":"0","dst":"105.19"},

The first line for 43C77D on the website and on my Pi didn't have a callsign, but here it acquired the callsign of a nearby RAF C-17 doing two circuits at Mildenhall. When the C-17 left the area the Typhoon became TARTN19 which was the callsign of the nearby Voyager in AARA8.

At first I though it was something in my code that if no callsign was set it was using the callsign from the previous entry but after doing a curl I found that the callsign was wrong in the data.

It's not a big issue (and not a complaint) but just thought it would be interesting to see what caused it.

Thanks regards, Rob.