Here's a shot of air traffic out of Des Moines snapped on Tuesday morning. The blue planes are going to or from Des Moines. The green ones are just passing overhead.
And here's a shot at the same time (8:30 a.m.) on Friday morning, from the flight-tracking site Flight Aware.
There are a few more planes leaving town today, but it's not the mass exodus we'd see after a NASCAR race, for example. Two of the exiting aircraft above are private charters. Some reporters travel in style. According to Flight Aware, a New York Times-chartered 10-seat airplane (red hash in image above) left Des Moines at 8 Friday morning. Destination: Manchester, New Hampshire.