What kind of exercise are you planning- giving them an aviation example and let them play "spot the mistake"?
Or would they have to apply their newly-learned leadership skills in a hypothetical situation?
As you've been asked to give an aviation perspective sticking with aviation examples may be fine as long as its clear how they relate to medicine and as long as it doesn't get to technical. (That's the advantage of examples like UAL 232, Eastern 401 or Kegworth- they're quite easy to understand even if you're non-aviation)
If they're motivated they may be happy to do a bit of thinking to transfer the lesson from aviation to medicine...maybe help them a bit with how it transfers to medicine.
Btw, if you come up with a new exercise would you mind sharing it with us? I always like to hear about other people's exercises and teaching strategies...