Standard Carrier Abbreviation Code identifying an individual common carrier. A three letter carrier code followed by a suffix identifies the carrier's equipment. A suffix of "U" is a container and "C" is a chassis
US Department of Transportation, Maritime Administration, Glossary of Shipping Terms, Washington, DC, USA 2008. http://www.marad.dot.gov/documents/Glossary_final. pdf, (Mrtm - Amer) {572}