Interesting, being trying to understand calls gins of units transiting British Columbia a USAF KC135R checked in at BLUEWATER302 , moments later when ATC answered back he became SWEETGRAS302 , same voice, very interesting . reg 58-0104 hex AE015B per ADSB
It sounds like you are getting aircraft confused. On October 20th the K35R, 58-0104, was using the callsign FRESH 72.
SWEETGRASS is the callsign used by
Iskwew Air. At the same time that 58-0104 was passing through the area there was a SWEETGRASS 302, a Piper Navajo (C-GPAK), operating between XQU to YVR.
I believe FRESH is a tanker callsign used when positioning fighters on long trips between bases, called
Coronet Missions. Other noted Coronet tanker callsigns are ADOBE, BLUE, BOBBY, CABAL, CAFE, CLEAN, FIST, GOLD, PETRO, ROMA, RUMMY, VINYL. They use 2 digit flight numbers.
On these Coronet missions the fighters also use standard callsigns, noted have been CUBE, DORY, EMCEE, HURON, JEST, MAZDA, PINE, RETRO, TABOR, TREND, ZESTY. They also use 2 digit flight numbers in sequence. Eg first flight would use 11-12-13-14 ... and second flight would use 21-22-23-24 ..., etc.
As FRESH 72 was at FL370 they did not have any fighters in tow at the time, so probably returning from a previous mission between East Asia and Alaska. Typically Coronet missions will fly between FL230 and FL270 when they are dragging fighters.
You also might hear tankers on tactical missions, usually with Bombers. Noted callsigns for these missions have been ABBOT, DEED, FIAT, FLAM, HIFI, KECK, PICO, REALM. Also using 2 digit flight numbers.
