FMCSA operating authority is often identified as an "MC," "FF," or "MX" number, depending on the type of authority that is granted. File a New Application: You can file a new application for operating authority.Apply for your trucking authority. When you have filed all of the paperwork necessary to operate a trucking company, the FMCSA will send you a letter of authority. You'll need to fill out a BOC3 form with this designation. How To Get Your MC Authority. Jog Road in West Palm Beach. Graham Auction Company will again lead this government surplus auction. Palm Beach, FL 33480. 561.838.5431. At the SWA, we have a commitment to excellence with an emphasis on respect in the way we treat our customers and each other.