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The aircraft needs to have an ADS B Transceiver and it needs to be switched on. I've seen C130s, C17s, AWACs, Eurofighters and various other military aircraft in the proximity of Ukraine at the beginning of the conflict.
Not so much these days.ETA - Currently there are four C130s sitting on the runway at Kangerlussuaq airport in Greenland. None are visible on either ADSB Exchange or Flight Radar 24.
Check out the live feed:
https://www.youtube.com/watch?v=dG4pb20EqJc
Not showing anything other than a Hercules going at about 1000ft every 10mins.
@Leshaches from the pitch changes of the engines it sounds like they are doing similar above us now, haven’t seen them yet though. Assume it’s F15s from the US base