The Air Transport Command consisted of two main divisions, the Ferrying Division and the Air Transportation Division. The ATC Ferrying Division was responsible for the transfer of combat aircraft to overseas bases, and their replacement. ATC transports were used primarily to deliver high value cargo and important personnel to overseas destinations. By the end of World War II, Air Transport Command had developed into a huge military air carrier with a worldwide route pattern.  Routes had been established to places that had seen few white men before the war, and where aircraft had been unheard of.  Airline personnel who had never left the United States before the war, had become veterans of long over-water flights to the remotest regions of earth.