This is exactly what we did to get aerials this season. Minus the squished workout ball.
Things to note though, you gotta have a budget. Helicopters go from $3,000 an hour up to $5,000. Where as a plane will cost you $150 perhaps.
The other issue is having the ability to take the door off, where you'll put the door or whether the pilot is comfortable enough to allow it. Not to mention knowing the process of getting yourself harnessed in properly.
From tests i've done, especially if you're using a T4i, don't have your IS on. Reason being even if the ride is smooth any jitter really defeats the purpose of how the IS works. I've found on particular lenses that when the IS is on, it tries to take normal amounts of motion and jitter out. When your in a Heli or Plane, depending on the type and how smooth it is, any quick jitters, or consistent ones more than your hands can create, which happen often, will cause a consistent jittery/jumpy effect. I've noticed this on RED's and DSLR's.
You're much better off just smoothing it out in post.
If you're shooting from a plane, you'll get some good shots but your total view amount is very very limited. Reason being the wing will be difficult to work with, depending on the size of the plane your usually stuck to the back. In this case your stuck to windows that will probably have smudges, smears and scratches, some non-removeable. When you go to stableize it in post you'll see these imperfections moving around. Especially when shot with a DSLR.
Avoid shooting directly into the light unless it's extremely Stable.
Make sure you talk to your pilot before flying and let him know what you're looking for, things you might ask of him, etc. It's better that he can tell you whats impossible from the start so you know what to expect and how to plan.