...Your airlines will only show at the airports they are scheduled to fly to or from in the PAI flightplans and only ALL will show if you have your AI setting at 100%  They don't just appear wherever you happen to be............they could disappear on landing for various reasons........maybe the airport hasn't enough parking gates. etc..........at my home airport they land and taxi to parking as they should but at others I have seen them just vanish.

  Look for American Airlines at airfields in the USA for example where you would expect to see them.

If you are flying under ATC control then say, ask for permission to land or take off, then ATC will control the AI accordingly.......make you wait or make the AI aircraft wait etc. If you just blunder about (as one does at times) then expect a 747 to ignore you at any time with predictable result. FS9 ATC controls the ai aircraft automatically.

With a full knowledge of how TTools works and how traffic .bgl files are compiled it is then a fairly simple task to make the AI airlines of your choice land or take off from whichever airport at whatever times YOU decide...........

But as I said you need to understand how to decompile, change and recompile the Traffic and PAI bgl files.

Hope this helps.....commoner

Click on the options menu at the top and go to traffic there you will see the slider. You can also see a entry for the amount of AI in your FS9 cfg file If you do not know where to find your FS9 cfg file read the sticky note at the top of the fs9 century of flight forum.