As a major corporate center. Houston is home to 18 Fortune 500 companies. The Port of Houston, one of the region's greatest assets, ranks as the nation's largest port in international tonnage and second in total tonnage. Houston's infrastructure is also strengthened by three airports, which form the sixth-largest airport system in the world, and a massive trucking and rail system that links the southern, south central, midwestern and western United States. More than 600 trucking firms operate in Houston, and two major rail systems operate 14 mainline tracks radiating from Houston. And with other destinations such as Austin, San Antonio, and Dallas just a short flight away, make Signature Houston your next stop where you will come for business but stay for the service and southern hospitality.