The Standard Carrier Alpha Code (SCAC) is a unique two-to-four-letter code used to identify transportation companies. It is used in computer systems and shipping documents to automate operations, register shipping information, and streamline container operations. The SCAC code is essential for any carrier or transport company wanting to move cargo in and out of the United States, and it is also used to identify vessel operating common carriers (VOCC) in computer systems and shipping documents. The code was developed in the 1960s by the National Motor Freight Traffic Association (NMFTA) and is widely used across various industries. Certain groups of SCACs are reserved for specific purposes, such as the identification of freight containers, privately owned railroad cars, and truck chassis and trailers