Air travel in Des Moines jumped 5.6 percent in June compared with a year earlier, according to monthly statistics released by Des Moines International Airport. Year-to-date, the airport reached 1 million passengers, specifically 1,086,980 people, and is on track to exceed last year's 2 million passenger milestone. Airport Executive Director Don Smithey told DesMoinesRegister.com that the increase in passengers is prompting airlines to add more flights. "They can make money here," he said.