Anywhere from 1 to about 25-30 depending on what is going on. A "typical" class might have about 16 (every 2 weeks). Of course it all depends on the sim scheduling and availability and such. When I was hired as an S/O in the 727. I went through with 15 other S/Os and some F/Os also. So that's why my class was about 25 people.

YMMV depending on what the company wants to do. The smaller classes were typically internal hires and were brought on the property in accordance with the completion of their contracted time. Of course that was all before we stopped hiring.

I hope this helps.