999 patients were treated and evacuated by medical helicopter in the region of Basel between 1986 and 1988. 687 were trauma patients (70.5%) and among them 53.9% were directly treated on the accident scene. Mortality during the stabilization prior to transport (2.6%) and during transport (0.3%) was low. The presence of a physician in the helicopter allows fast and intensive in-field care. All life-saving procedures like endotracheal tubes (36.3%), closed intercostal drainage (7.4% of trauma patients) and cardiovascular reanimation (1.9), even hemostasis, or fixation of fractures are performed. Early in-field intensive care by medical helicopter decreases lethality and mortality and must be recommended by severe trauma.