At the beginning of the 20th century, only a few years after the first experimental flights of the aviation pioneers, there were debates about the utility of military aviation during a conflict. In April 1917, when the United States entered the war, their air force still had only 65 officers and 220 aircraft. It was essentially old equipment or training.
Today, the country has the largest military air fleet in the world with about 15,000 aircraft (and 11 aircraft carriers). It’s more than Russia, China, France, the United Kingdom, Germany and Canada combined.