I think this thread has lost its way, particularly with the inappropriate diversion off thread to AF and Concorde.
Is the fundamental question not really about maintenance?
Piston engined aircraft never were particularly reliable at their best, particularly when compared with modern turbines. I know I'm old, but 40 years ago when I operated round engined aircraft it was difficult enough to find PMA quality parts and reliable engine, propeller and component overhauls? Today, it must be nigh on impossible.
Surely it must be about calling time on the remnants of WWII era aircraft still operating in revenue passenger transport roles today? Today's travelling public deserves better.
Last edited by twochai; 7th Dec 2015 at 21:43.