I never met Don , but I'm somewhat indebted to him. At the 1969 Willow Grove , Pa. NATs, he took the picture of me at age 18(I was unaware) readying my JD Falcon II for flight. I use that pic as my "avatar" on this forum.
In 2010, Tom Luciano told me that he discovered it online and that Don captioned it " nice flying Falcon". Forty one years later, that old pic helped rekindle my interest in U- Control.
Thanks, Don and may God speed.