(AP) — The Jackson-Medgar Wiley Evers International Airport is delaying security checkpoint upgrades and improvements to the concourse after a downgrading of its revenue bonds by Fitch Rating Service. Fitch said the loss of the airport's second-largest carrier could bring higher fees to airlines and higher costs to passengers. Dirk Vanderleest, Airport Authority executive director, told the Mississippi Business Journal (http://bit.ly/1kpHyvg ) Fitch's designation of a "stable" credit outlook for the airport assures borrowing costs won't go up on the $39.4 million bond issue "at this time." Delaying the projects by up to 12 months keeps the debt off the books as Fitch Ratings makes further evaluations of the Airport Authority's credit worthiness, Vanderleest said.