I think a company called "Results Centre" runs them.
Just FYI though, I was a cabin manager and recruiter for a major airline and can tell you that doing a course doesn't give someone any advantage over another candidate.
All it might do is give them some common sense advise about how to dress, behave and answer standard interview questions. Most of that can probably be found for free on the internet anyway.
But if it gives people the confidence to get their dream job then I guess it maybe what some people need.
Cheers,