I. The plane never took off.
II. The plane took off.
----IIa. The plane landed, intact.
----IIb. The plane crashed.
--------IIb1. The plane crashed on land.
--------IIb2. The plane crashed at sea.
----IIc. The plane never landed (ie. shot down, collided mid-air, blown up, black hole, worm hole etc)
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