A bit off-topic as this book is about WW1 but it looks very interesting and is due out at the end of the month (if Amazon is to be believed)
Shooting the Front: Allied Aerial Reconnaissance in the Great War by Terrence Finnegan
Hardcover: 524 pages
Publisher: J H Haynes & Co Ltd (29 Jan 2009)
The blurb reads
"Terry Finnegan examines the impact of aerial photography on the air forces of Britain, France and the US above the Western Front in this pioneering new work. His comprehensive history gives an authoritative account of aerial reconnaissance and the interpretation of photographs as they evolved into the most important sources of intelligence along the entire Western Front during the First World War. This magnificent book includes a wealth of images, many never before published, which help the reader to relive the dangerous but exhilarating experience of aerial observation during the First World War."