If you're a Louisvillian with deep roots and good ears, you probably recognize the man who tells you how to use the moving walkway at the airport. His name's Jack Fox. He was a DJ on WHAS for years.
And if you pay attention while traveling, you'll hear Fox and the airport's female voice, Carolyn Hopkins, in other airports. In 109 other airports, specifically. Also in the New York subway, the Mayo Clinic, various Capitol buildings and the Kennedy Space Center.