Plenty of U.S. citizens have been terrorists: http://en.wikipedia.org/wiki/Category:American_people_imprisoned_on_charges_of_terrorism http://en.wikipedia.org/

Plenty of U.S. citizens have been terrorists: http://en.wikipedia.org/wiki/Category:American_people_imprisoned_on_charges_of_terrorism http://en.wikipedia.org/wiki/Category:American_people_impris... It's still ridiculous (as you say, we have to trust the pilots, the employees, etc.. - but a background check can mitigate that)