Thats very true, the a320 is far from experemental 
What you need to do is go start/programs/microsoft games (or where every FS is in the start menu) Aircraft editor.
Open up your 'experemental' 8)  A320 and go right down to the bottom of the right hand screen.
If its for an A320 then follow the next set of instructions.
find where it says atc type, and go a few names down to find 'airbus'
then go to model, there type in 'A320' (or A321 if its the later version).
Save the changes, close the editor, and start a VFR flight in your bus. when you are asked to contact departure you should be saying this.
"blah de blah de blah, is type AIRBUS A320"
hope it helps m8