“Fly” goes a little further in acknowledging the risks and responsibility or lack thereof involved than the recent “Skywalkers: A Love Story,” but perhaps not far enough.

Where “Fly” fails is in explaining how this all works. It’s a remarkably untechnical film and you come away with more questions than answers about the mechanics of jumping.

There's the matter of the fate of one of the subjets, which adds poignancy, as well as some ethical questions.

Fly not only tells the stories of those who live on the edge but shares their unique, healthy philosophy on death.