In February 2011, Airbnb announced its millionth night booked. In January 2012, the company announced its five millionth night booked. In June 2012, Airbnb announced 10 million nights booked, doubling business in the previous five months. Of these bookings, 75% of the business came from markets outside of the continental United States.
Chicago–O'Hare – The third-largest hub for American in terms of number of flights and American's primary hub for the Midwest. About 28 million passengers fly on American through O'Hare every year, or about 77,000 people per day. American has about 35% of the market share at O'Hare making it the airport's second-largest airline after United.
Some cities have restrictions on subletting for a short period of time. Airbnb has published a list of regulations and requirements for cities in the United States. In some cities, collection of a transient occupancy tax by Airbnb is required. In many cities, hosts must register with the government and obtain a permit or license. Landlords or community associations may have restrictions on short-term sublets.