Just an idea - perhaps planes with no remaining fuel should be unnaffected if they draw a 'plane explodes' chit.
No fuel doesn't mean no fuel fumes. Its that vapor that makes things go boom.
Ammunition has a nasty habit of making a loud noise if it isn't happy too. Let's face it, when you smack a bullet on the bottom it gets very unhappy, makes a loud noise and then runs away at speed.
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