The patients that hire air ambulance crews cannot go on common airline charters . This is when these people need special medical attention and/or a well experienced medical technician. As they are not US citizens and/or must be sent to a new hospital , medivac companies are a necessity. There generally are men or women who have need of a catheter or similar equipment when these people fly. Many bedridden patients that have chosen to be treated in a hospital in another city are exhalted to discover that folks look for transportation from airevac outfits. Elderly men and women sometimes will try to search for medical flight charters with the assistance of the internet and the www.