Between 1986 and 1988, 999 patients were treated on the emergency scene, then transported with the rescue-helicopter in the Basle area. 687 were victims of a trauma (70.5%) and 287 patients were suffering from an acute internal medicine disease. We performed in-field therapy on the accident scene itself in 53.9% of all the cases. According to our scoring system the presence of a physician was absolutely necessary in 56% of all the cases. Air rescue by helicopter allows fast transportation of patients and immediate high quality intensive care. The low mortality rate during treatment before transport (2.6%) and during the transport itself (0.3%) shows that early beginning of medical treatment on the accident scene is connected to better survival chances.