A book was recently put out called "Never Again: A Self-Defense Guide for the Flying Public." which gives techniques for defeating a terrorist in a plane.
As the writer of the article says "My stance on terrorists hasn't changed since 9/11. If a terrorist attempts to seize control of the jumbo jet in which I am riding, I am totally in favor of doing whatever is necessary to hasten his reunion with the 72 dark-eyed virgins awaiting him in heaven, as long as I don't have to go there with him. (I'm quite shy around large groups of attractive women.)"