Passenger activity at Des Moines International Airport was up 1.9 percent in August from the same month a year ago, according to numbers released today. A total of 189,660 passengers went through the airport during the month. For the year, a total of 1.47 million passengers have gone through the airport, up 6.2 percent from the first eight months of last year. Cargo activity for the month was down 9.9 percent, and is down 3.6 percent for the year.