Kalitta Air has a total of 24 747-400F in service. They are a contracted airline and fly strange and unusual cargo runs all over the world, from guns, medical supplies, and refugees; they haul it all.
I befriended a 747 captain for Kalitta Air recently. The stories he has told me really make me wish we had this livery in the game. Seeing as they have a fairly large fleet of these aircraft, I think it would be a wonderful addition to the simulator.