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.
It's like being at the kids' table at Thanksgiving - you can put your elbows on it you don't have to talk politics... no matter how old I get there's always a part of me that's sitting there.