What am I doing wrong

I've been trying to add AI with TTools but not sure what I'm doing wrong. For example I downloaded
Filename: alaska_airlines_horizon_air-asa-united_states_su05_fp.zip
License: Freeware, limited distribution
Added: 31st July 2005
Downloads: 1688
Author: Carl Edwards
Size: 120kb
TTools compiled it. When I go to KSEA (Seatac) I don't see any Alaska or Horizon aircraft. Is there someting else I need to do.
Do I also need to add these Alaska aircraft to my aircraft folder or somehting?
Thanks
Filename: alaska_airlines_horizon_air-asa-united_states_su05_fp.zip
License: Freeware, limited distribution
Added: 31st July 2005
Downloads: 1688
Author: Carl Edwards
Size: 120kb
TTools compiled it. When I go to KSEA (Seatac) I don't see any Alaska or Horizon aircraft. Is there someting else I need to do.
Do I also need to add these Alaska aircraft to my aircraft folder or somehting?
Thanks