Sure, I have 6 Learjets.

You just need to make sure the textures you add match the existing model.  If you want to add more C-172's look for repaints of the default C-172.

Then read your handy "adding aircraft" tute here http://www.simviation.com/acinstall.htm and "how to add repaints" here http://www.simviation.com/lair/Repaint2002.htm

Make it simple: www.projectai.com
Project AI has easy to install AI aircraft that cover quite a few of the worlds airlines.

If I'm reading this correctly you need to add the extra aircraft to Aircraft.txt. This is the last default entry on the list
AC#36,124,"Piper Cherokee 180 Paint2"
To add an aircraft copy/paste this entry below itself & change the AC# number to the next in sequence. The next variable 124 is the cruising speed & the last one between the quotes is the title of the aircraft. AI aircraft are identified by the exact title= name from their Aircraft.cfg entry between the "xxxxxxxxxx". Each variation needs a separate entry. I don't think there's any limit to the amount of AI aircraft you can add to the database. After it's recompiled with TTools you can use the new AC# numbers in your flight plans.

This is all explained in detail in TTools ReadMe.htm.

I found the easiest way to start out is to replace the default aircraft with similar 3rd party examples in Aircraft.txt. Simply change the name like this.
AC#36,124,"Exact title of new plane here"
When it's recompiled your 3rd party aircraft will use the default AI flight plans for AC#36 instead of the Cherokee Paint 2. Once you get used to the idea you can start creating new flight plans for any aircraft in your hangar.

PS. Before modifying anything I suggest taking backup copies of the 3 text files produced by TTools in case it all goes wrong.

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Please don't think I'm trying to be clever. If you know how to do it I really don't understand the question. ???

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Use TTools to add the extra variations for each aircraft to the AI database as I already explained.

Hi Coppershot. I think we have to distinguish between flyable aircraft & AI traffic. The flyable variations (repaints) of any aircraft are added to Aircraft.cfg as explained in my Add a Repaint tute. http://www.simviation.com/lair/Repaint2002.htm
Providing this is done correctly the new variations will then be selectable from the Create a Flight menu.

TTools is used for the AI traffic. Once you add new variations of any aircraft to the AI database they can be used as AI aircraft but they MUST be installed properly to work. This includes adding the new Aircraft.cfg [fltsim.x] entries. If these are ordinary flyable aircraft & not special unflyable AI drones like the default Dash 8  they must be selectable from the FS9 Aircraft menu to work as AI traffic.

I'm still not quite clear on what the problem is. Lets try again. Using the 737 in my tute as an example you add the new entry to Aircraft.cfg. This will be Paint 3

[fltsim.3]
title=Boeing 737-400 Paint3

It should be selectable from the FS2002 Aircraft menu as shown in my walkthrough. Check it out in the sim to make sure it works.

Now, to use it as AI traffic this needs to be added to the AI database with TTools. I assume you already ran the decompiler & have a file in the TTools directory named Aircraft.txt. Open this file in Notepad or Wordpad & add the new variation to the bottom of the list below the last entry. Make sure you renumber it.

AC#36,124,"Piper Cherokee 180 Paint2"  <<<-- this is the last default entry
AC#37,430,"Boeing 737-400 Paint3"

Exit Notepad saving changes. You now have 4 variations of the 737. Run the TTools compiler to add this to the AI database. It won't appear as AI traffic in FS2002 unless you add AC#37 to FlightPlans.txt & recompile it. You can either create new flight plans or change some of the existing ones.

PS. You can do this as many times as you wish, either in a batch or one at a time. Remember to recompile the database each time you update it.

I don't think you have done all I'm telling you or it would work. ???

The main criteria are that the variation (repaint) is installed correctly (selectable as a new variation from the FS2002 menu) & the AI database is correctly updated with TTools. If not, it can't possibly work as AI traffic. This needs doing carefully as a small typo can mess it all up.

I don't know of any limit to the number of variations you can use. If there is a limit it's certainly more than 3 for each aircraft. My Add a Repaint walkthrough is only basic & you can change the ATC entries for the different variations in Aircraft.cfg later if you wish. The older FS2002 version of TTools should be fine but it wouldn't hurt to use the latest version. This is a little more user-friendly & compatible with both FS9 & FS2002. http://www.simviation.com/fs2004utilities1.htm
Make sure you read the instructions carefully & understand how it works.

Sorry Coppershot. You've almost beaten me. I must be losing my touch.

I can only repeat what I've already told you. If the new variations all show up correctly on the Select Aircraft menu & you can fly them this is not the problem. I suspect this lies with what you're doing with TTools. First, all new variations you wish to use as AI traffic must all be added to the database by editing Aircraft.txt & recompiling. There are a lot of default flight plans & unless these new variations are correctly added to those flight plans using the airports you visit at the times you're there you won't see them.