In recent years, labor rates, not part prices seem to have been driving escalation in aircraft maintenance costs. For example, civil aircraft engine part prices actually dropped 0.7% in the 12 months to September 2017, according to the U. S. Producer Price Index. Non-engine parts were down 0.1% over the same period.
Part of the reason may simply be that demand for many of the underlying part materials is not increasing rapidly. ICF Principal Richard Brown estimates...
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