I am a member of the Airline History Museum (the Save A Connie folks).

Last summer we had a course for Celestial Navigation taught by an old navigator on Connie's from the 50's. Lots of retired TWA around here (KC). Anyway, it was a course that stretched over a couple weeks on Saturdays. Obviously not enough to get a rating, but an excellent primer taught by someone that used to make their living doing it on Connie's. If they work up another course I will post it on here.