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
http://www.usatoday.com/news/world/2010-05-31-flight-warrant-arrest_N.htm

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?
4 answers 4