What was a significant achievement of aircraft during World War I?

The introduction of aerial combat tactics during World War I marked a significant achievement in the development and use of aircraft in warfare. This era saw the transition of aircraft from primarily reconnaissance purposes to active roles in combat. Pilots began to engage in dogfights, employing different maneuvers and strategies to gain advantages over their adversaries.

Innovations such as synchronized machine guns allowed planes to fire through their propellers, drastically changing the nature of aerial engagements. Tactics evolved to include formations and coordinated attacks, demonstrating the aircraft's potential not just for reconnaissance but as an essential instrument of military strategy. As nations experienced aerial conflict, the lessons learned during this time laid the groundwork for more sophisticated air combat tactics in subsequent wars.

While the other options mention advancements that would become significant later, such as jet engine technology and stealth capabilities, these developments did not occur during World War I. Furthermore, the standardization of flight regulations evolved gradually and was not a primary focus during this period as countries were still exploring the capabilities of flight rather than formalizing regulations.