 People traveling through DIA and other Colorado airports left behind $18,502 worth of loose change at TSA checkpoints last year. Around the country, the number is usually close to a million dollars every year. While Denver is the sixth busiest airport in the world when it comes to planes and passengers, it's only the 11th busiest for TSA screening in the country. That's because a lot of people come through DIA on connections but don't go through security checkpoints.