Always clearly remember when I was studying for my commercial pilot licence many years ago. In one class, an engineer took us for a tour of an airline hangar.

Always clearly remember when I was studying for my commercial pilot licence many years ago. In one class, an engineer took us for a tour of an airline hangar. He stopped in front of an engine on a rig and explained that EACH blade on the intake fan stage cost something like $40,000. That was about 4 times the price of the car I drove to that class!