There are ways that the FBI would be able to learn that Hannibal and Will left this night, on this plane, and flew to Paris. But that is where the paper trail ends. The apartment in Paris had been under another name for a long time, as have the bank accounts, both contingencies for just this possibility (or, perhaps more truthfully, eventuality). The only thing the FBI will have at that point is the vain hope that they will be able to comb through a city of millions for two people who are motivated to stay hidden and know how to do so. Once they leave this plane, they are in the wind...and there's no reason for anybody to even start looking for them until Dr. Bloom gets Will's message on her voice mail, by which time they will either be landed or very near to it.

Hannibal ponders the practical concerns of their arrival and time in Paris, everything from the method of transportation to the apartment (taxi to a nearby hotel then walk from there) to how they will stock their larder (several small shopping trips by each of them alone to stock up, and then only infrequently as absolutely necessary). He settles on a few tentative plans, then his mind goes quiet and alert as they lift off, as they depart the United States for, hopefully, a long time, if not forever. Once the plane has leveled out into its cruising altitude, he opens his eyes to glance over at Will and assess how he's doing, a casual glance from a casual traveling companion disguising a concerned one from a friend and lover. Will is taking all of this very well, but it would not surprise Hannibal if he had some difficulty at some point. Some stress or panic or the like. After all, he has just left his entire life behind to throw his lot in with a man he had once sought to murder. Hannibal does not doubt Will's loyalty for an instant, but some cognitive dissonance would not be wholly unusual.