Just pointing out the costs that apply to a turbine aircraft!
It is any low usage aircraft with big calendar time items Dick.
Price a C441, C402, C310 or R44 over a 20 year period @50ish hours per year. While the Cessna in private ops (not C441) do not require 12 year engine overhaul the R44 do. I don't play with heli's but think only 2 rebuilds on Robinsons allowed - but I could be wrong on that, if not it is scrap in 36 years and 1800 hrs. Again I don't play much with C208 but sure it has no year life yet, maybe it will live to be 40+?