No Airline AI Traffic

This may be a strange / unique issue I am having with FSX. No matter where I set the sliders for airline traffic percentage I never see a single airliner on the ground at any airport. I hear them talking on ATC and see them flying in the air, and I also see general aviation aircraft on ground and in air. But no airliners. I've also tried installing MyTraffic for FSX to see if that would change things, but still nothing. Any ideas about this issue?Thanks,Michael