I’ve never flown X-Plane in Multip-Player…and from what I gather, it isn’t all that popular. Or perhaps easy. I did happen upon a thread and utility that I’ve installed that might allow us to make it happen.
You do have to register (free) in order to have an account. I don’t know much about much, but apparently it then connects to a master server or something.
If someone with X-Plane wants to give it a try sometime, let me know and I’d love to see if we can get it working…
To fly online with VATSIM, you will need to download and install a software application which connects your Flight Simulator with the VATSIM servers. There are several such applications, and all are free. Clients are available for FSX, FS9, P3D and X-Plane. These applications also enable you to communicate with ATC and other aircraft. To do this, a headset with microphone is very useful, but not required. Text communication is always available. There is extensive information and help for all pilot clients in the VATSIM Forums.
(X-Plane only) XSquawkbox is currently the only client to connect X-Plane with VATSIM. X-Plane is an alternate Flight Simulator product to Microsoft Flight Simulator products and Prepar3D and can run on Windows, Mac OS and Linux. The download includes installation instructions.