In the past year, I have been pulled into two flight emergencies. Over the past 20 years, I have been involved in at least a half dozen flight emergencies.
Fortunately, the outcome as far as I know it has been very good for the patients but many of these cases are not without anxiety and undue stress.
Like most people I respond out of a sense of responsibility to help someone in distress.
Source: In-Flight Medical Emergencies during Commercial Travel — NEJM