The Experimental Aircraft Association (EAA) Fly In at Oshkosh, WI is the largest fly-in event in the world. Held annually, thousands upon thousands of planes fly in to what is otherwise a small, sleepy little airport. Spill will be heading up there later. But right now, thousands are flying in with a bewildering variety of planes. Air Traffic Control there has to stay on their toes. You can listen in here.