[kvnnews]

Can only imagine what complex parts of the aircraft cost. If an empty metal/plastic box is 50k, what does it cost to replace a hydraulic pump or an electronic board in the avionics?

[ceejayoz]

Aviation parts are always expensive, but if you're flying a plane designed in 1950s and now only used by a handful of militaries, it's gonna be more.

Boeing is mass producing parts for 737s. They are no longer doing so for 707s.