I remember back in the mid 80's with 2 x VIP "A" model machines we used to work on about 10 maintenance / service / turnaround support hours per flight hour until you get them settled down. Customisation and MOD Status was always fun. Plus they are all "hand made" and I doubt any of them are the same, similar maybe at best. You need the minimum of at least one "blackhander" LAME and a "moon goon" Avionics tech per 2 machines permanently at their base of ops. Things may be better with the Safran engine but still.