title: Why are helicopters so expensive?
authors.affiliation: Sikorsky Aircraft Corp, Stratford, Conn, USA. ems@sikorsky.com
authors.forename: Vaughan
authors.initials: V
authors.lastname: Askue
mesh_terms: D017732:Air Ambulances / Q000191:economics* / Q000592:standards; D002201:Capital Expenditures; D004869:Equipment Safety; D006077:Government Agencies; D014481:United States