There have been occurrences where SF trained individuals and US military personnel have been on aircraft subject to hi-jacking. The result was usually they ended up being the first thrown from the aircraft onto the runway after being shot or stabbed.

Here is some US government advise for what to do in a Hijacking.

http://ntc.doe.gov/curriculumareas/cita/ci_awareness_guide/T4travel/Hijack.htm

Now if in an emergency situation such as a airline hijacking and I had Cade Courtley in my face saying "I'm Cade Courtley and I'm about to save your life" I just know that my day has just gotten a whole lot worse. Now of course if the aisle was filled with Aberdeen Casuals, Millwall bushwhackers or even some Hells Angels then retaking the aircraft might be a different story.

Cade Courtley doesn't even have a facial twitch.