Not forgetting Cessna, for them to change the DVD player as the Citation X comes with two standard Zone 1 (USA) DVD's to change it to a multizone DVD it costs USD $25000.
Its not too difficult to bypass the zone or region controls on any DVD or CD player.
Or copy the movies
you have already bought onto another disc so there is no restrictions on them
All the information and software to do it no cost is readily available on the net