title: Why are helicopters so expensive? Part 2.
authors: Vaughan
authors: V
authors: Askue
mesh_terms: D000401:Aircraft / Q000191:economics* / Q000295:instrumentation / Q000592:standards; D002201:Capital Expenditures; D002568:Certification; D003365:Costs and Cost Analysis; D004867:Equipment Design; D004869:Equipment Safety; D006077:Government Agencies; D014481:United States