It includes writing style that Saint-Exupéry perfected in his later books, including "Man" or "Night Flight". In "Courrier Sud" we do not feel quite lonely driver crossing the Sahara, anxiety breaking down in the middle of nowhere in a hostile environment, the heroism of the pilots in the most desperate situations. The metaphors and images are interesting but not enough accomplished, it does not dream
In short, reading quickly before moving to the next.