Chicago’s O’Hare Airport is back on top as the busiest airport in the nation. There were more than 900-thousand arrivals and departures at the airfield. Those figures knocks Atlanta’s Hartsfield Jackson Airport to the number two spot. Meanwhile, a record 105-million passengers flew through O’Hare and Midway last year. Chicago officials believe part of the increase in air traffic to the addition of close to 50 new routes, including several international destinations.