P'man.
Depending on the amount of light available for the day - but I am assuming fairly bright sunlight - set your
camera to Tv (ie, Shutter priority). You don't need small apertures for any DOF. I don't see the need for
Auto ISO either. Pick about 1/400sec, and most importantly, DO NOT lean the camera on any part of the
aircraft while pressing the shutter. Hold it in your hands, as this will dampen/eliminate any airframe vibrations.

I have never been in a helicopter, but have had heaps of flights in light planes.
Am.

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Confession: I'd be using Manual, because I have mostly encountered fairly consistent lighting condition, and
I can easily vary the f-stop as required. But since you asked... Main thing is to keep the shutter speed up(pish),
but be aware that no shutter speed will stop airframe vibration.