Air travel survived decades of terrorism, including attacks which resulted in the deaths of everyone on the plane. It survived 9/11. It'll survive the next successful attack. The only real worry is that we'll scare ourselves into making air travel so onerous that we won't fly anymore.
If you think technology can solve your security problems, then you don't understand the problems and you don't understand the technology.
People don't understand computers. Computers are magical boxes that do things. People believe what computers tell them.
I am regularly asked what the average Internet user can do to ensure his security. My first answer is usually 'Nothing you're screwed'.