Double-decker bus
With the exception of coaches, double-decker buses are uncommon in the United States. Many private operators, such as Megabus, run by Coach USA, employs double-decker buses on its busier intercity routes.
Chicago Trolley &amp; Double Decker Co.
The Chicago Trolley & Double Decker Co., runs the original hop on hop off tour and private rental service based in Chicago, Illinois, United States. It is the largest tour operator in the Chicago area, with a fleet of 26 double-decker buses and 39 trolleys.