Unwanted IVAO AI in aircraft selection list

Howto get rid of these many IVAO AI in the aircraft selection list?

They are not visible in: C:\Program Files\Microsoft Games\Microsoft Flight Simulator X\SimObjects\Airplanes

but see folders for each of them (about 200) in:
C:\Documents and Settings\<Username>\Application Data\Microsoft\FSX

They are also in the folder:
C:\Program Files\Microsoft Games\Microsoft Flight Simulator X\SimObjects\IVAO_MTL\..,
for each AI-aircraft one subfolder.

Found it:
In MS XP: Start > All Programs > IVAO > Ivap > MTL > Hide all aircraft
And they were gone in the FSX select aircraft list.

Tnx,
Paul