What was a significant outcome of the RAF's expansion before World War II?

The significant outcome of the RAF's expansion before World War II was the enhancement of its aerial defense capabilities. This expansion involved considerable investment in both personnel and technology, leading to an increase in the number of aircraft and the development of advanced aerial strategies. The focus during this period was on preparing the Royal Air Force to defend the UK against potential threats, particularly from Nazi Germany, which was rapidly expanding its own air force.

By bolstering its aerial capabilities, the RAF aimed to create a robust defense system that could protect British skies and deter aggression. Innovations in aircraft design, fighter tactics, and early air defense systems were critical components of this expansion, ultimately contributing significantly to the RAF's effectiveness in securing air superiority during the early stages of World War II.

While other options like international cooperation and the formation of NATO became relevant in later years, they were not direct outcomes of the pre-war expansion of the RAF. Establishing military bases in Asia did not arise from immediate strategic needs prior to WWII in the same context as improving aerial defenses within the UK.