Interesting overview except for the conclusion (quoted below). The pre/post-911 distinctions are doctrine (resistance vs. submission), training and hardened cockpit doors, which the article completely misses. Would be nice if they'd interview one of the CEO's (e.g. Jeff Smisek) who doesn't appreciate how they poach premium seats where the airlines would otherwise get their maximum returns. KENS 5: Inside the secret world of federal air marshals Indeed, there hasn't been another deadly attack on a U.S. airliner since 2001. The TSA clearly deserves some of that credit. Not just security screeners, but also the elite Federal Air Marshals, who are likely to be the last line of defense against another 9/11.