How does flying from Paris, France, to Mexico City, Mexico, has anything to do with flying thru U.S. Airspace?

Man arrested on warrant after flight diverted

How did the flight manage to get diverted all the way north to Montreal, Canada?

Who was that "man" and what was the arrest warrant about?
Update: The other thing you should notice is the Arrest Warrant was a U.S. Warrant so why was the plane diverted to Montreal instead of just landing somewhere in the United States?
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