If you are having trouble with AI you can turn down the number of aircraft in your settings. I normally run 75% which provides enough AI to keep thing interesting but not in the way while taking off or landing.

my 2002 started this months ago and I don't know why either ... or how to correct it w/o uninstalling fs2002. most aggravating is two red call signs showing for many "flights" AND ATC talking to both of them 
papa-metro usaf 1953-57

Duplicate flights: This can happen when you install additional traffic and the author has used the default flightplans as his template,  just replacing the default commercial ai a/c with real world ai a/c.

FS2004: locate the '....Scenery\World\scenery' folder. FS2004 will recognize multiple 'traffic*.bgl files. 'Traffic030528.bgl' is the default file. You may find other files with names like Traffic_USA.bgl, Traffic_Europe.bgl, etc. To de-activate any of the files rename by changing the file name extension, i.e 'Traffic_USA.disabled'. By manipulating the file names you can determine which flightplan(s) give you the best result. You must restart FS for the changes to take effect.

FS2002: locate '....SCENEDB\ATC\Scenery'. FS2002 only recognizes 1 traffic file, named 'traffic.bgl',  If this file has been changed (done using TTools), giving you duplicate flights,  a back-up of the default file named 'Traffic_ORIGINAL.bbb' will exist in the same folder. Rename the 'traffic.bgl' file (you should at least change the extension) and then rename the back-up to 'traffic.bgl'. You'll  have default flights back.

Conjestion: When you start a new flight (Fly Now) both Sims place all ai flights that were scheduled to depart in the 15 minutes prior to your start time at the gates/parking, if there's room. These a/c now all want to depart  causing the backlog. If the airport has only 1 active things can really slow down, with some a/c disappearing while in the que...... .

The only solution I know of is to reduce the ai traffic until your away, or depart without clearance.  

Dave

I deleted the default FS traffic file and am running just the airlines I added and still duplicates. I swear 4 out of 5 planes is duplicated 2 or more times.

I am wondering if duplicates could be from the fact I'm running airline traffic AI files such as 'Delta' and 'South West' but I also am running 'TrafficUSA' which includes these airlines as well. If each program shows the exact same flight path at the same time could it cause duplicates?

I think I may start by turning them all off and then turning on the traffic files one by one...when i get time anyway.

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For FS2004:

Yup, thats your problem. TrafficUSA uses the default traffic file as its template. At least one of the others must have done so also.

A handy tool for for working with ai is the MS FS2004 Traffic Toolbox SDK:
http://www.microsoft.com/games/flightsimulator/fs2004_downloads_sdk.asp#traffic

Once installed, a new flight screen "Tools" menu is available. With the 'Explorer' function you can sort thru all active ai flights, in this case, to locate duplicates. (If you right-click the column header bar you can select 'file path' and the traffic file names will be displayed).

The Explorer is best used from  FS windowed mode, Alt+Enter to toggle.

Dave

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This is, as mentioned above, because  one or more of your addons is an edit of the default traffic file, with all the  flights (airline and GA) left in the file. Only the airline liveries have been changed. This type of addon ai traffic is best used as replacement for the default traffic file, rather than additional traffic. (Unless you dont mind seeing formation flying   or gridlock at airports   )

For additional airline traffic, without duplicate flights, look for downloads that are 'advertised' as real world schedules. The author creates these from scratch so dup's should not be a problem.

Dave