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In an airliner you are often cruising at 580 knots at about 35000 feet. When you look out at this altitude you are seeing (let's say) 40 miles so a car, if you can pick it out, moving at 70 mph in a 40 mile field of view isn't going to look like it's moving fast at all. By the time it has driven one mile you've flown about 12 miles and probably lost sight of the car.