I noticed that simblaster (simblaster.com) sells a usb type interface for about $60 for the futaba 9c that works with about eight flight simulator programs and one of the programs is real flight g2. The only real flight portion of the program it does not work with is the intenet link which I guess is the one where you fly with other people on the internet. I too have seen controllers and usb interfaces sold separately by companies which makes me wonder about some of these post about needing to have that exact controller to operate that specific simulator software. I am going to check with a friend of mine also to try to use his rf-g2 with a different usb interface. I will see what I can find out about these serial numbers. It might be another one of those security things if you know what I mean..
Frank
ps: I have seen where Aerofly pro needs it's own interface due to a special chip in that interface but I am not sure if the interface is usb or gameport. I am looking only for usb type interfaces because I hear they work best.