What contributed to the decrease in mishaps in aviation?

The introduction of the angled flight deck is a significant factor that contributed to a decrease in aviation mishaps. The angled flight deck design allows aircraft to take off and land more safely by helping to separate landing and takeoff operations. This design minimizes the risk of collisions during these critical phases of flight. Additionally, the angled deck enables aircraft to approach at a more optimal angle, which improves control and reduces the chances of accidents that can occur with a traditional straight deck.

The other options, while they may have some impact on aviation safety, do not directly address the structural and operational changes that the angled flight deck provides in terms of improving the overall safety of flight operations on aircraft carriers.