According to a study published this week by The Annals of Emergency Medicine, patients with traumatic brain injuries who are transported by medical helicopters have higher chances of survival and better recoveries than ground-transported patients. The study, The Impact of Aeromedical Response to Patients with Moderate-to-Severe Traumatic Brain Injury reviewed 10,314 cases of patients with moderate-to-severe head injuries, 3,017 of which were transported by aeromedical crews. The speed at which a TBI patient arrived at the hospital via helicopter did not necessarily make the difference in their recovery, more than the fact that the crew of medical professionals staffing the helicopter had advanced training in critical care. Helicopters typically carry certified flight nurses, and/or emergency room resident physicians which means that they can perform advanced procedures such as intubation and catheterization before brain-injured patients reach the hospital. You can read more about this study here.