Related Tangent: Forget about abbreviations, how about a call sign not your N number.
Yesterday taxing to get up to runway 25 at KLZU, there were numerous ATP school planes taxing as well. For whatever reason (ego?) the call signs for ATP are different from the N number.
(names made up to protect the innocent and because I couldn't remember them anyway)...
"Career Track 1234 holding short 25" I looked at saw an ATP plane N 5678. This was followed by another call from the other side of the runway from the other taxi "Career Track 2345 holding short 25". It was an ATP plane N 8989.
At this point the tower got flustered, and responded "OK, whose is holding short on Yankee", followed by "Who is lined up first holding short on Whiskey?" I'd think it would be easier for the tower to keep planes separated on the ground if they used a call sign that's the same as the big numbers and letters painted on the side of the plane.
It seems to me that a whole lot more flight schools are using "callsigns" on the radio now than there used to be. I'd say it's in the last few years, but that also coincides with me getting a new job where I end up at a LOT more smaller airports, so perhaps I'm just seeing it more.
Formerly, callsigns were mostly used by the airlines or the military. I flew into IXD a few months ago, and there was a "Pit Boss 21" in the pattern. Now, what's Pit Boss? I incorrectly assumed it was an ANG F-16 or something like that. Nope, typical trainer from a flight school, "Pit Boss" being chosen for...