On Monday, October 26, 2020 at 11:23:06 AM UTC-7, wrote:
At a contest in Region V, i.e., southeastern United States. It was either at Cordele or Perry:

Glider pilot: "Towplane, 5 knots faster, please."
Tow Pilot "Which towplane?"
Glider pilot: "The Pawnee."
Tow Pilot: "Which Pawnee?"
Glider pilot: "The white one."
Tow Pilot: "Which white one?"

There were at least four white Pawnees towing at the contest, all of which had visible identifying letters/numbers. They finally figured out which towplane should fly a little faster.

Ray
W8

I was once towing out of Truckee when a glider being towed out of Minden called "off tow." My towplane did a sudden turn and began a fast descent, and my only option was to release at a lot lower altitude than I wanted. I climbed out okay and they were apologetic (and tore up my tow ticket!). Moral of the story: include your tail number when communicating with the towplane pilot.

Tom