City Tours Inc. is a Texas Corporation operating several tour and transportation companies including Alamo Sightseeing Tours, Alamo Trailways, Grand Trolley Tours, Grand Double Decker, Alamo Cruisers and GO Airport Shuttle, San Antonio’s Official Airport Shuttle provider. It is certified as a Historically Underutilized Business (HUB) by the State of Texas, and as an MBE,ACDBE,DBE,SBE by the South Texas Regional Certification Agency. Through its Trailways affiliation, the company is also certified by the Department of Defense.