What was the primary role of aircraft during World War I?

During World War I, the primary role of aircraft was reconnaissance and combat. Initially, planes were used mainly to gather intelligence on enemy troop movements and positions, which was crucial for military strategy. This reconnaissance role evolved as aircraft became armed, allowing them to engage in combat with enemy planes and ground targets. As aerial warfare developed, air-to-air combat became a significant aspect of the conflict, leading to the emergence of famous fighter pilots and the establishment of tactics and strategies unique to aerial battles.

While transporting goods and personnel did occur, it was not the primary focus of aircraft during this period. Commercial passenger flights did not exist to any significant extent at that time, as the aviation industry was still in its infancy. Search and rescue operations, although beneficial, were not a major function of military aviation in World War I compared to reconnaissance and combat roles. Thus, the answer that highlights reconnaissance and combat captures the essence of how aircraft were utilized in the context of the war.