I need to look for something similar.
The problem I see in my environment is that the entry-level (cheap) airplanes in the schools/clubs are nearly fully booked with trainings, and it's the instructors, who override bookings of ordinary PPLs, or simply take the aircraft despite your booking. And the same instructors don't cancel their bookings in the system, when their student cancels the appointment. So we have a "we will gladly teach you to fly, but after that, we'll screw you, mwhahahaha" situation
