On the airline statistics page I'd like to see my airlines total predicted maintenance bill totalled for the coming year, divided by number of airframes scheduled.
So add up all the cost of all the A,B,C,D checks that are scheduled for the next year at todays prices then divide by number of planes with schedules on them.
I'd find it useful to find whether my fleet is competitive against other airlines in terms of maintenance cost, a bit like we do for fuel per pax km.
Simon