Mathematical Programming Guides Air-Ambulance Routing at Ornge

Introduction The province of Ontario, Canada has approximately thirteen million residents spread over approximately one million square kilometers. Ontario ensures a high level of medical care for all residents partly through an advanced medical transport capability. The not-forprofit company Ornge provides these transport services primarily through air-ambulance services, although it also has several land ambulances. Ornge transports approximately 19,000 patients every year. These transports can be broken down into “scene calls” and “inter-facility transports.” Scene calls are those calls that immediately spring to mind when one thinks of air-ambulance service: paramedics respond to the location of an accident by