First of all, don't worry about how obscure or eccentric your fear might seem. Everyone has their own little special quirks about themselves, and that's what makes you you.
To help overcome it, you need to try to comprehend it this way:
I'm sure you've heard that flying is the safest mode of travel, which I know is hard to believe, seeing how devestating the crashes are when they DO happen. Traveling by car is something like 1,000 times more dangerous. Try and think of it like this: Approximately, the chances of a large commercial boeing jet crashing somewhere in the world today: 0.001%... the chances of it crashing in, of all places, your hometown: 0.00000001%... and lastly, the chances of it crashing directly on your roof: pretty much nil. Just concentrate on that when you get ready for bed, and try some relaxation techniques too. I hope things work out for you...
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-Vyx ^..^
Spiral out, keep going...