Yep it's natural to be scared... you just have in the back of your mind that possibility of it happening. And don't think for a moment that those poor victims saw it coming, so you just have to be aware of the risks, but not totally paranoid because that wouldn't get much accomplished.
I think I said this already, but my parents were going to fly to New York for a cruise they had scheduled, which leaves from there... now it looks like they'll be driving there instead--not taking any chances. Though the chances of a car wreck are greater than the chances of a plane crash. Or this is what I've been told... granted it was before the scare.
Well, I'm confident that airline security is not overlooking a thing at this moment, infact this could be the safest time to fly ever, really.
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"If I am close to the music, and you are close to the music, we are close to each other." -Bono