Quis custodiet ipsos custodes? This is latin for “who watches the watchers?” A question that is explored to some degree in this movie. A great number of people in this post-9/11 world derive some bit of comfort from the knowledge that randomly placed Sky Marshalls exist on flights in and out of the United States. But what happens when the system that is intended to protect us, turns against us? What happens when the watchers become corrupted? And while much of this movie tests the bounds of credibility (like the notion that Airbus’s A380 will ever be commercially viable), it still posits an interesting and entertaining answer to the question.