Multiplayer LAN weirdness

I fly with friends over a Local Area Network.
Here are some questions about multiplayer:
1. Can ATC be used during multiplayer?
2. Does everyone have to have the exact same plane for you to see it as the plane they selected?
(If player A chooses an F-15, do I have to have the same F-15 on my computer in order to see his aircraft as an F-15?)
3. Why are there no AI aircraft in multiplyer?
Are there any tricks or plugins to fix these?
Here are some questions about multiplayer:
1. Can ATC be used during multiplayer?
2. Does everyone have to have the exact same plane for you to see it as the plane they selected?
(If player A chooses an F-15, do I have to have the same F-15 on my computer in order to see his aircraft as an F-15?)
3. Why are there no AI aircraft in multiplyer?
Are there any tricks or plugins to fix these?