You mean player aircraft? This is a thread for realistic flight routes, meaning mirroring real life operations. According to my list, only B763s and B764s regularly fly to and from IAD. This is almost exclusively United on European routes. There’s also some domestic B763 cargo traffic. If you wanted to make realistic routes for your player owned fleet, any destinations utilizing B752s, B763s and A332s/A333s would probably work if your B762s can reach.