Erik Larson. Dead Wake: The Last Crossing of the Lusitania. Brunswick and London: Scribe, 2015. Over 200 successful transatlantic crossings, but get sunk just one time and nobody remembers that. Mainly a narrative history but there's nothing wrong with that from time to time. Also, like the next book, it was free (thanks, Richard!)
Lynn Olson. Citizens of London: The Americans Who Stood with Britain in its Darkest, Finest Hour. Brunswick and London: Scribe, 2015. A history of the Anglo-American alliance viewed through the lens of three men who, Olson argues, did most to bring it about: Averell Harriman (head of Lend-Lease), Edward Murrow (CBS correspondent), and John Winant (US ambassador). I'm not sure how necessary these men were, or could have been, to the alliance, but they were certainly signficant in their own right, so it should be worth a read.
Antoine de Saint-Exupéry. Southern Mail/Night Flight. London: Penguin, 1976. I have long wanted to read Saint-Exupéry (not counting The Little Prince). These are his first two novels, based on his experiences as a commercial pilot pioneering air routes across the Sahara and South America; by all accounts some of the most beautiful writing about flying in the golden age.