The American Taxi Company services the Chicago suburbs. In fact, the company mandates that all rides begin or end in a suburb; rides are not allowed from Chicago to Chicago. This includes rides to Chicago's O'Hare International Airport and Midway International Airport, which count as the city.
The American Taxi Company handles the entire Chicagoland area including Milwaukee's Mitchell Field. As with the Chicago airports, rides are not provided between the Milwaukee airport and an address in the city of Milwaukee. Rides between the cities, from Milwaukee to Chicago or vice versa, are permissible, however. Each driver is an independent owner-operator, and American Taxi is not liable should something go awry.