THERE IS NO SUCH THING AS FREE CRIME IN INTERNATIONAL AIRSPACE!
In researching "international air" and "committing crimes," you find that the same laws apply to international waters. One article, again more specific to crimes committed in International Waters, notes that "the simple fact is, no one lives in international waters forever. Once you reach the port, you may have to show responsibility for the crimes that you’ve committed. That is, if no one catches you before. So no, international waters are not technically no one’s land where you can do whatever you want."
And as Jason brought up... what crimes were actually being committed on the plane? I mean the only illegal activity outside of gambling without a license, is The Concierge shooting a guy for cheating. Yes, we see people betting on how long someone will survive a snake bite or a pool of piranhas, but the act of those specific events are happening on the ground where laws will surely punish those perpetrating it!
Also Paul, based on your past experience... what were your feelings on the acting of the guy being devoured by Piranhas?