Oh yes!

There are servers all over the world available to FS9 users.
These include VATSIM, a realistic live air traffic control service, with thousands of pilots on daily, as well as smaller servers such as Netwings, which I fly on sometimes. Being a new member myself, I am not sure if SimV has its own active server.
http://www.netwings.org:8080/
http://www.vatsim.net/

EDIT:  Also try this program to see what active servers are around when you have time to fly! http://www.chocolatesoftware.com/fshostspy/

Have fun,

-Sean 

Go into the mulitplayer tab in FS2004 and type in netwings.org  in the IP address box, and the server should come up.

VATSIM uses specific software to connect with their mandatory ATC services, so I suggest going to the pilot resource center on their website, and finding out what you need to do.

FSHost shows the IP of the server, and you simply type that in to the IP box in the multiplayer tab to have the server show up so you can connect.

Don't forget to change your callsign from the default!

you could also try IVAO, another big network just like vatsim.