I toured last week. I don't know the number of planes. They said but I don't recall.
As for condition, they are pretty old and look like it. Seats torn, no GPS, kinda faded looking paint. Mechanically they seemed very sound, although I really wouldn't know. Everything seemed pretty clean, no leaks that I saw or anything.
All in all, I am sure I will probably fly in worse planes at some point in my career and I didn't feel unsafe about their planes.