You can still get shocked without a direct path to ground...air breaks down at 6kV/in at sea level and goes up with altitude. That's why vehicles can take lightning strikes and you'll get arcs from the frame, suspension, axles and/or wheels to ground through the air just like
@Andy J. said.
Company I use to work for did testing on helicopters like that and ones used for working on transmission lines in remote locations. You can feel the effect by standing under a transmission line and hold an umbrella as high as you can and touch the shaft (giggity) even while standing on an insulated mat. No direct path to ground, but it'll still shock you if the electric field is high enough. Guys working out of the helicopter wear Faraday suits themselves & bond their suits & helicopter to the line so they don't get shocked. Pics of testing below were without bonding and on an insulated platform to keep the helicopter fixed. Wish I had video of the tests done with the blades moving...cool blue lightning strikes off each blade!
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