FMCSA operating authority is often identified as an "MC," "FF," or "MX" number, depending on the type of authority that is granted. At DOT Operating Authority we are happy to help with any filing assistance you may need!Apply for your trucking authority. This guide will simplify the process of obtaining MC numbers and trucking authority in ten steps. It's the letter from FMCSA with the date your authority went active and what authority was granted. Complete Trucking Authority Packages. Our complete authority packages are designed to give you every filing actually required to get you on the road. The Bay Area Toll Authority (BATA) manages the toll revenues from the Bay Area's seven state-owned bridges. An Operating Authority Letter includes a company's name, address, USDOT Number, and MC number. This letter is necessary for booking loads.