The Airline Pilots’ Association International has a bunch of kick-ass recommendations for its members:

Suicidal hijackers, however, should be dealt with in an aggressive fashion in which the cabin and cockpit crew work together to eliminate the threat as soon as possible using all available means.� This may include, as examples, depressurizing the aircraft or drastic aircraft maneuvering designed to keep hijackers off-balance and away from the cockpit….

Aircraft cockpits are equipped with a crash ax, which should be considered a potential defensive weapon in the event of a suicidal hijacking.� The ax should only be wielded if the crewmember is convinced that using it is necessary to save lives � the pilot must be both mentally and physically prepared to take the life of a cockpit intruder, or the ax could be used against the pilot.

Link Discuss (Thanks, argh!)