When talking about movement of people in the extinct Soviet union, the usual narrative is that it was kinda like a locked system: rural workers weren't allowed to move from collective farms, internal permits were required to move from one location to another, with some closed cities that were completely isolated from the rest of the country for security ans state matters. While at the same time it's often mentioned during it's existence a continuous migration of people to the most important cities and new industrial centers, a fair social movility system and the internal tourism to the countryside (dachas) and the seaside resorts of the warm coasts of the black sea, to the point they developed their own supersonic airliner, the Tupolev Tu-44 (although this was more propaganda than functional). So, how does the system work considering the usual incentives of a capitalistic passenger transport industry were none?