Some more ruminations about air forces at the Diplomat:
Let’s take the United States as a baseline (although the U.S. arrangement is one of the most unusual in the world, most people are familiar with the basic dynamics). As of December 2015, the United States operated 13,655 aircraft; 5,062 in the Air Force, 4,759 in the Army, 1,249 in the Marine Corps, and 2,585 in the Navy. Between the USAF, USMC, and USN, the United States flies 2,838 combat aircraft (fighters, bombers, and attack aircraft), constituting 21 percent of the total fleet. The rest of the U.S. air forces consist of helicopters and a wide array of support aircraft, including the transport and tanker aircraft necessary to deploying and maintaining vast overseas operations.