1. Air ambulance: data collection and transparency needed to enhance DOT oversight : report to the Committee on Transportation and Infrastructure, House of Representatives Publication: Washington, D.C. : U.S. Government Accountability Office, July 2017 Subject(s): Air Ambulances -- economicsFees and ChargesInsurance Coverage -- economicsCost SharingData CollectionDisclosureGovernment RegulationHumansUnited StatesUnited States. Department of Transportation.Centers for Medicare & Medicaid Services (U.S.)