I really can't even imagine how unpleasant such a hard, jarring landing would be with a long fusion or fusion to sacrum. It seems ridiculously foolhardy to me, and without seeing the website or claim, it seems like the surgeon is being boastful about how great his results are.
I thought I was interested in skydiving once, a long time ago in my early twenties. I called some skydiving outfit and was told that they would strongly discourage me from ever trying it, and at that time, I had just a L4-S1 fusion.
Gayle, age 47
Boston brace as a teen for AIS
Oct 2010 fusion T8-sacrum w/ pelvic fixation, TLIF at L4/5.
Feb 2012 major A/P revision for broken rods
mom of Leah, 13 y/o, diagnosed Jan '08 with 26* thoracic JIS (age 6)
4/08 26 degrees, brace 16 hrs/day
9/08 17 deg. OOB - brace discontinued
9/09 30 deg, resuming brace
5/10 VBS Dr Luhmann Shriners St Louis
4/15 stable 5 yrs post-op, 18* T/ 22* L, Risser 2
also mom of Torrey, 10 y/o son, 16* T, stable