Go for the biggest zoom range you can manage while you are in the air. The only issue you have is that generally light aircraft are very small compared to modern cars, so a physically long lens can be a bit awkward if you are sat with your shoulder almost pressed up against the window. But that can be hard with any camera. If you can manage it I would go with the 24-105, I don't think you will need the UWA, since from above 1000' everything looks pretty small.
The last flight I took where I actually spent time shooting, instead of actually flying the plane, since I was in the righthand front seat I took my Sigma 20-40 on my 50D. That is equivalent to 32-64 on 35mm and I really wanted longer not wider. We were at 3000' for much of the trip though. This was in a Piper PA-28-180 Cherokee, a low wing single engined aircraft.
Of 47 shots 11 were at 20mm and the rest were at either 37mm or 40mm according to the EXIF. Of the keepers it's even more swung towards the longer end, 4 at 20mm and 20 at the long end. Here is an example shot at 37mm while flying at 2100'. You can actually see the bungalow where I now live in this shot.
Also remember that you will be shooting through moulded perspex windows, so distortion and odd polarisation effects are going to be much more visible in very wide shots.
Sorry I have never had the chance to fly in a light helicopter, so can't give more specifics. The back of an RAF Puma doesn't really count.