Military AI Works

When I get rid of all default AI a random A321 appears, any ideas why?

Well I would guess that you haven't got rid of the default AI, according to your statement.

What scheme is the A321 in?

I have got rid of the default AI. Its in a default blue scheme

Well firstly your profile says that you use FS9 but FS9 does not have a default A321, so I have to question this.
Especially as you say that the default traffic file has been removed.

I am on FSX not FS9 I just download lots of FS9 for use as static objects etc.

When you removed the default AI traffic, which file did you remove or re-engineer?

How are you placing the FS9 static objects in FSX?

John

I amusing ADE 175 for object placement and I removed the main default traffic (the A321s etc.)

John will be able to explain in fair greater detail, and accuracy, than myself but you can't just add FS9 aircraft to FSX scenery and expect it to work.
They have to be compiled as a ground object, I believe, and normally would be part of a lib although it is not necessary but they do have to be ground objects or I think that they will just not show up.

I use SAMM to make them static aircraft

Ok that makes sense, however despite what you think it doesn't sound like you have got rid of the default dynamic traffic.

Lets not get sidetracked with object placement.