Air ambulance
ARCH Air Medical Service (ARCH was an initialism for Area Rescue Consortium of Hospitals) is an emergency medical service (EMS) that provides critical care air ambulance service in Missouri, Illinois, and the surrounding regions. Air ambulance programs (also known as Medevac) offer transport by helicopter (rotor-wing) or fixed-wing aircraft. ARCH Air was the twelfth program in the U.S. to offer such services when it began operating in March 1979. Transporting approximately 4,200 patients per year by helicopter, ARCH aircraft are staffed by a pilot, nurse and paramedic. Flights are 80% inter-facility (hospital to hospital) and 20% scene.