But Don,
All of the points that you mention about cars are also true of aircraft.
So why DO we ground aircraft but not cars?
For the larger aircraft at least, the much higher pumping rate generates static that can produce arcs on non-bonded and earthed fuel components. Especially when disconnecting. On cars the flow rates are low enough for static to dissipate as fast as it is generated. Unless the car is a Formula One car on an eight second "splash and dash" of course, which is why there are automatic earthing strips in the pit bays.
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Through difficulties to the cinema