In December 2010, listings for AMR Corporation, the parent company of American Airlines and American Eagle Airlines, were deleted from Expedia's site. The decision resulted from a dispute over the degree of access to the site's customers. AMR reversed its decision in April 2011, allowing tickets to once again be sold through the aggregate site.
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.