Wind, Sand and Stars by AntoineDeSaintExupery. ISBN 0151970874
It's about the early days of flying mail in South America and Europe. But more deeply it's a book about understanding the meaning of human existence.
I re-read this book regularly and I'm always surprised by the new things I find in it.
I should have said that this book is not fiction, rather it is largely autobiographical. Saint Ex was one of those early mail pilots. -- RichieBielak
Source of the quote PerfectionIsAchieved.
What's the French title? PerfectionIsAchieved suggests the linked book is a translation. -- ScottMcMurray
Original french title is "Terre des Hommes". -- StéphaneGourichon