I use:
http://www.projectai.com/
(airline packages and entire AFCAD collection)
http://www.mostrealisticai.com/
(realistic schedules to merge with project reality airline packages)
http://www.world-of-ai.com/
(airline packages with built-in ai aardvark skins (
http://www.ai-aardvark.com/)
All the packages are free easy to install and better quality than the payware traffic packs that are out there.