How can I reset AI to default?

[WebbPA]

I don't have any TTools flight plans or any AI enhancers but my AI flights have fallen down to unacceptable levels.

ATC is set to 100% but all I can see/hear are a few GA and an occasional Learjet.  No heavies at all.  The GA are all around me in the air but they sparsely populate the airports.

Is there some mystery configuration file, other than fs2002.cfg, which seems fine, that I can reinstall?

[Travis]

You'll need to go into the FS disks and find default.dp, which contains all the AI stuff.

[WebbPA]

I messed things up way beyond that.  I did too much editing of the aircraft.cfg files so FS couldn't find the airlines and paint jobs it was looking for.