Passenger traffic at Des Moines International Airport was up 4.1 percent in July as compared with a year ago, the airport announced today. A total of 191,780 people went through the airport during the month, up from 184,178 the previous year. For the year, traffic is up 6.9 percent, as 1.28 million passengers have used the airport. Cargo numbers were also up 1.2 percent year over year in July, but are down 2.5 percent for the year.