A U.S. Department of Transportation study shows that Piedmont Triad International Airport’s passenger numbers dropped significantly over the last year.

Guess why —- 86,000 Skybus passengers in 2008, compared to zero Skybus passengers in 2009.

As a result, PTIA dropped from the 86th-largest airport for passenger boardings in 2008 to the 90th-largest airport in 2009. Only the Cincinnati and San Bernandino airports saw bigger declines.