Do you have any idea how much that costs?
You still have a fuselage that is 60 years old. How many 60 year old cars are tooling around your neighborhood? FWIW-The 135 family has been rewinged, re-engined, and given upgraded avionics. Fuselage corrosion, and a plane that is flat worn out is what we have sitting on the ramp.
Scotth hit it pretty well with his post. Another consideration, manpower; we can maintain the newer aircraft with less people working fewer hours. Our maintenance guys/gals run 12 hour shifts trying to keep up. New airframes might allow them to get a weekend off now and then.
