The air war in WWI was very much a tactical war, so Hooton's book concentrates on the tactical and operational aspects of that war. He does especially well in discussing the 'inner and outer battle zones' ie areas around and behind the front lines. He also cover's the few instances where strategic war was attempted eg the airship and Gotha raids over Britain, and the French and British raids into Germany. Most importantly Hooton places the development and impact of each major air force into the context of what each 'could' achieve; given resources, manpower, tactical limitations and industrial power.
As far as other books go..... whew! Where to start? In many ways there were two distinct air war's being waged concurrently during the Great War. One was the wild melee of air combat between opposing fighters which were trying to dominate a particular part of the Front so that it's own side's recon, and artillery spotting could take place unmolested. This is the side which is most often portrayed in books - the aces and stories of daring-do. It's a valid topic and makes for great reading, but in only a few key instances did fighters have a direct impact preventing the Army Co-op units from successfuly carrying out their duties. For example French Chasse units ultimately dominted the skies over Verdun and stopped the German FFA units from spotting the highly vunerable Voie Sacree, the single road that led from Bar-Le-Duc to Verdun and over which all reinforcemenrts anf material passed. The RFC dominated the skies over the Some in mid 1916. The Jasta's dominated the skies over Arras in 1917. But for most of the war recon, artillery spotters and ground support managed to successfully carry out their duties.
The real nitty gritty of the air war (that which was of direct benefit to the ground war) was that done by the reconnaissaince, artillery spotting, contact patrols, bombers and ground attack Squadrons. Rarely do these key units figure in general histories, other than to be mentioned as background detail. Yet it was these very same units that the generals relied on to stage their various offensives, or counter the enemies attacks. The ground war in many ways revolved around how well these units did their job.
There is a common belief that it was only the 'offensively minded' British that constantly patrolled well into enemy territory. Whilst this is in part true for fighters, it is not so with Army Co-op units. Patrols of 15-20 miles behind enemy lines were standard for the recon and bomber units of all sides; and to my mind they more typically illustrate the role of air power during the Great War.
Sorry for the rambling. Here are a few recommendations, which lean towards to recon, arty, bomber ground attack units:
* In The Teeth Of The Wind, by CPO Bartlett
* French Strategic and Tactical Bombardment forces of WWI, by Rene Martel
* Biplanes and Bombsights: British Bombing in WWI, by George Williams
* German Army Air Service, by Alex Imrie
* Sharks Amongst Minnows, by Norman Franks
* First Blitz, by Neil Hanson
* First Of The Many, by Alan Morris
* The Royal Flying Corps in WWI, by Ralph Barker
* Hostile Skies, by James Hudson
* Independent Force, by Keith Rennies
* The French Air Service War Chronology, 1914-1918, by Frank Bailey
* RFC Communiques 1917-1918, by Chaz Bowyer
* Schlachtflieger!, by Rick Duiven and Dan-San Abbott
To name just a few! Some can be quite expensive, so AddAll is a good site for finding good quality second-hand editions.
http://used.addall.com/
And Amazon as well.