Hi, I don't know which topic should I post this into, and whether it's common among Western fighters or not, but from the end of October Hungarian Air Force Gripens, C-17s and An-26 fly with ADS-B activated and thus can be seen on sites like flightradar24 and the like.
http://www.flightradar24.com/data/airplanes/-huf
An example:
http://www.flightradar24.com/data/airplanes/39
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