In February 2011, Airbnb announced its millionth night booked.[34][35] In January 2012, the company announced its five millionth night booked.[36] In June 2012, Airbnb announced 10 million nights booked, doubling business in the previous five months.[37][38] 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.[15] About 28 million passengers fly on American through O'Hare every year, or about 77,000 people per day.[15] American has about 35% of the market share at O'Hare making it the airport's second-largest airline after United.[15]

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.[9] Landlords or community associations may have restrictions on short-term sublets.

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