TO: KAF Recon members

FROM: Squad leader

BY WAY OF: Flight Lt. Recon7

SUBJ: Standing orders camp on AZAZ0909

>>2502302

1. I imagine that any aircraft can refrain from transmitting its callsign. Commercial flights want to be tracked so they will generally not do this. Some military flights evidently are under orders to keep a low profile and their ADSB is turned off or selectively enabled. There are numerous scenarios where an a/c will not transmit any callsign. Some of the radar sites designate this as "blocked".

2. Ditto.

3. Airspeed is a function of many factors. First, look up what kind of plane it is, then look up its specifications. The specs will give maximum speed and cruising speed, as well as max altitude and typical cruising altitude. ATC can tell an a/c what altitude to fly at for safety reasons (avoid collision) and a/c can also vary speed/altitude as necessary due to wind, weather, thunderheads, approach pattern, etc. You should understand the speed as a function of a/c capabilities and mission.

If you see a military Gulfstream or Citation flying at >500 knots at 42,500' you can probably assume they are in a hurry to get somewhere therefore it is an important flight to transport military brass.

Hope that helps.