The cases that look for help from medflight companies require specialized medical care. As they are not able to fly onboard large commercial airlines . This is sometimes due to the fact that they are not in a medically stable situation , air evacuation fleets must be hired. There usually are men or women who necessitate advanced cardiac life support — and therefore these are the case patients that do not have the ability to go by public charter planes. It is known widely within the field and profession of emergency medicine how there are cases that are severely ill but they are in a non critical situation. A lot of elderly patients sometimes try to search for medevac crews with a hospital volunteer.