USAF F-16s from Aviano over Romania

In these minutes (11:15 CET) we’re tracking near Cluj, Romania, an aerial refuelling in progress between an USAF KC-135R (reg. 58-0100) and one (but probably it’s the only aircraft, with a flight of different figthers, with the ADS-B transponder switched on) USAF General Dynamic F-16 (callsign VIPER31) departed from Aviano AB.