TRUCKING AND COURIER SERVICES, EXCEPT AIR (SIC E421)

Establishments primarily engaged in furnishing trucking and transfer 
services for freight weighing more than 100 pounds.  This industry 
group also includes establishments primarily engaged in the delivery 
of individually addressed letters, parcels, and packages (generally 
under 100 pounds), except by means of air transportation or by the 
U.S. Postal Service.