Well, this is not really true anymore and all destinations are given to everybody. Of course you'll get US flights only if you have US visa.
Some "cleaning" has been done on the scheduling department and now it seems things are working differently.
777 pax is flying on a regular basis to China (pek, can,pvg) , Washington, lagos, Dubai, Johannesburg and Luanda. But very often they are used on Europe and other african destinations when pax booking is high,
777 F is flying regurally to Liege, maastricht Dubai, Hong kong, Mumbay, Dehli and Chennay plus a lot of occasional destinations in Europe, Asia and africa. Other Freighters are coming so probably other destination will be added soon.