What is the main conflict in Wind, Sand and Stars by Antoine de Saint-Exupery?

Wind, Sand and Stars is an adventure story that also contains thoughtful observations about flying and about the remote areas of the world that SaintExupery visited in his travels. Since Saint-Exupery was one of the pioneers of flight (he patented a number of devices that helped to advance the technology of aviation and to make modern aircraft possible), his observations about flying are of historical interest.