I'd recommend that you look at the maintrnance records.
Also, while looking at the hours, see when the next majors are. Things like the Star annual & next engine overhaul. Has the group got a fund for these things are they going to ask everyone to cough up on the date?
And ask to see the finances & booking sheets for the last/next few months. It's no good buying into a group that's in debt or where you can't book it till November. What are the rules/methods for booking?