thanks for the replies but can anyone else go back and read my original question and answer on that?
I shot Hollywood movies from helicopters for three decades. Chris' advice is spot on. For live motion shooting, shutter speed is irrelevant as long as it's 1/60th or so. Movie cameras shoot at 24 fps, right? That's about 1/50th.
Seldom do you overcrank when shooting aerials, and then it's not to get a higher shutter speed, it's to smooth out the camera/helicopter motion.
When shooting motion media aerials, by far your largest problem is keeping the camera still enough, especially with a difficult-to-hold form factor like a DSLR. ie, be very careful you don't drop it overboard.
Stay wide and go slow. At "60-80 mph", you'll get nothing useful.
Use the helicopter as your zoom lens. Anything longer than 35mm equivalent and you're toast.
Stay calm. It's a stressful environment.