Passenger activity at Des Moines International Airport was up 2.8 percent in February compared with a year ago. A total of 168,983 passenger went through the airport for the month, up from 164,316 passengers a year ago. For the year, activity is up 2 percent, as 340,812 passengers have passed through in the first two months. Cargo activity was down 4.4 percent in February, and is down 5.4 percent for the year.