Task: Text Categorization
Input (English): Context: RegionsAir was a Part 121 regional airline. Its headquarters and maintenance base were located at the Smyrna Airport in Smyrna Tennessee USA. The hub airports for RegionsAir were Lambert-St. Louis International Airport (STL) and Cleveland Hopkins International Airport (CLE).RegionsAir operated under a code-sharing agreement with TWA and American Airlines to provide flights to communities as AmericanConnection from Lambert-St.
Question: The document can be classified to which topic? 
Options: 1)Film, 2)EducationalInstitution, 3)Building, 4)Company, 5)OfficeHolder
Output (English): 4