Goodreads meta-data is 39 pages, rated 3.93 by 594 litizens.
Genre: Musing.
Verdict: A period piece.
Though it celebrates the grit of his comrades in facing the Nazi juggernaut of 1940, the pamphlet was banned in Vichy France because it was dedicated to St Ex’s very good friend and the captain whom he admired, Léon Werth, a Jew. St Ex got out but Werth did not. It takes the form of an extended letter, musing on life that does go on. Ironically St Ex did not survive the war but Werth did. Slight though it may be, St Ex has as always an uncanny knack for finding the le mot just each and every time, some lyrical, and some mournful. 
The first draft was to be the preface to Werth’s novel, Trente-trois Jours, about the Defeat and the flight of refugees. But when Werth went into hiding in the Jura, and St Ex escaped to Lisbon where he revised it into a more general reflection on time and place and recast Werth a symbol of all of France.
That is why the Vichy authorities banned it. Treating a Jew as French was bad. Explicitly admiring this Jew for his patriotism was worse. But making him a symbol of FRANCE was intolerable.
As always with St Ex the sky is there, and so is the sand of the Sahara.
Yet even here idiocy is to be found. One reviewer on Amazon says that St Ex ‘fought valiantly to keep France from becoming Socialist at the hands of Charles De Gaulle, and it probably cost him his life.’ Yep. Was that a Tweet from the Twit in Chief? There is no point in trying correct this nonsense, best just to savour it.