A Look at Sky Diving
This is absolutely for the thrill-seeker couple, and possibly
the most extreme type of ceremony imaginable. There are a range
of considerations when planning a sky diving ceremony, such as
audibility when exchanging commitment vows, music during the ceremony,
and any readings.
In addition to this, you need to consider any guests, their age,
and any fears they may have.
One idea is to have the ceremony on the ground, either before
the sky-dive or after. That way, you can accommodate your guests,
as well as incorporate the jump into the ceremony.