First things first. In order to see any AI aircraft at any airport you must have that airplane as part of your fleet. You can not display something that you do not have.
Now my self I use the world of ai to download ai aircraft
There you can down load flight plans for a whole lot of ai aircraft
Of course you have to have ai traffic set about half way or more but you also might need to turn your sliders up in order to see them. Mind you if your system is not up to the task your frame rates will drop drastically. FSX could even crash. When you first install FSX or FSXSE it builds a file called FSX.cfg or FSXSE.cfg it will set you sliders to a point that should not cause any stutters.
And the more detail you display the more your frame rates can drop. It depends entirely on the system you are using.
I have my sliders maxed out but than if you look at my signature you will notice that I have a descent system. There are at least 3 factors that control this in no particular order
CPU speed and # of cores it has: The speed and amount of RAM you have and your Graphics card.
Not all store bought systems will come with a graphic card and will usually have what is called on board graphics. Most if not all of these systems will not support FSX or FSXSE maxed out.
The quick way to tell is to run a program called DXDIAG and you can also look to where you plug your monitor into if it is a plug with about 10 to 12 pins in it this is a VGA plug not the best in the world and not for displaying high graphics you want at least a digital port.
With FSXSE you can turn the sliders up a little more because of the changes Steam made\The other thing that can effect frame rates are programs running in the background. Things like antivirus programs and so forth.
Any icons that you see on the right hand lower part of your task bar are programs that are running in the background, most of these are not a problem but some can be
