I shot from Blackhawks in Iraq with a D3 and the Nikon f2.8 zooms, shooting a little more open and a little faster shutter speeds than I normally would, because I'd been told the high-speed vibration from the chopper could affect the quality of the shots; and maybe it would, but with just a little higher shutter speed, things worked fine. (I was shooting only in the daytime, mostly under overcast skies.) The thing that most affects the quality of the shots is the air, because you're usually shooting through a lot of it. I flew several times in and around Baghdad, just before a winter storm system came through, and on the first day, with lots of dust and smoke in the air, everything looked soft; the second day, after a rain-and-snow storm, everything was very sharp. So keep that in mind, when you're envisioning what kinds of shots you want. (Nothing wrong with soft, unless you don't want it.)
I've also shot out the window of a fixed-wing plane a few times, once after a forest fire in Minnesota. I don't know what kind of plane it was, because this was years ago, but probably a Cessna (it was high-wing), and it's harder than you'd think to actually shoot at a down-angle; that is, to get a shot like Bernard's, as opposed to more classical landscape like Eleanor's. The forest fire had actually run through a hog farm, and killed dozens and maybe hundreds of hogs, and we could see their bodies on the ground, but to get close enough, and vertical enough for a shot, the pilot had to fly both low and then tip up on a wing to get enough down-angle. He was happy to do it, but I was a bit uneasy.
You can try most of this out for a few hundred dollars. You need to go to a general aviation field, tell them what you're doing, tell them you can fly when they're not busy, and ask for a good rate. Lots of times they have planes and pilots (often newer pilots) sitting around, and for a couple hundred bucks, they'll take you out for a spin. Helicopters may cost more, but I don't know, because I never tried to rent one.