I don't think it will impact us. We always think it will though. We had the guy in Austin who flew into an IRS building... you would think hitting a government building would have had a big impact on us, but it didn't.
I think if anything, these accidents or attacks show how ineffective our planes are as weapons. The 150 that got stuck in the office building after 911 showed how little energy we carry. Cory Lidle's Cirrus hit a building and only killed those onboard the plane. Remember a B-25 hit the Empire State Building? I imagine most of our planes would have bounced off! There are tons of examples of how we couldn't hurt people if we tried.