Part1 is on the Plane. Part2 is at the Parking Position(in the Air, Anchored and CanCollide off).
If Part1 touch Part2 it changes a GUI.
How it works?
Aircraft Guidance Docking System shows you if you need to stop.
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Aircraft Guidance Docking System?
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I would reccomend magnitude. something like:
magnitude = (part1.Position - part2.Position).magnitude
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