many sup ops still dont have licensed Dx....as the DO has the operational control, not the dispatcher does in 121 domestic and Flag....in one of my past airlines, a sup 121 cargo, they only hired licensed DX...but we were called flight followers per the Regs.....ALso, our operation had crew schedulers that took care of the crews, hotels and such...we worked the flight plans, Wx cut releases and helpped the crew...customs, USDA, over flt permits, etc.....121 sup operations can vary wildly from one company to another in the way the are approved to run...