I have been so irritated by all the duplicate flightpaths (where two planes exactly the same fly the same flightpath a foot apart blending the textures and causing mass caos around airports) that I deleted all the AI I downloaded here and at avsim then I went to projectai and downloaded every single link I saw: every airline, every cargo, and every military file.  I did go back and add the FedEx AI I downloaded here because it is not available at project ai. Didn't notice any other major airline being left out.

I'm running 100% traffic and it can slow up some but I backed off a few settings and its back to 'stable'. I would have to say I no longer have 'duplicate flightpaths' in the few days I've been flying with the new files.

BTW, this is a pic of a airport with all the parking just about taken up (modified AFCAD). I'm sure you guys can tell which one it is, right?

PAI is great. Although they do not have a package for ATA (AmTran), which definitely is a major American airline and is based off of one of my home airports (KMDW).