There usually are air evac specialists which transfer patients in the US. Besides , private air ambulance crews are contracted since they have a necessity to be transported or are for non emergency situations. Patients necessitate ventilator support – and consequently they are unable to travel on the usual air travel charters. Occasionally there are cases that have need of an IV monitor and care for special medicine or a BLS flight doctor, so jet ambulance outfits setup an air evacuation with them. Medical air evacuation operations are researched by customers with a licensed hospital volunteer.