When did Hap Arnold win the first Mackay Trophy?

Hap Arnold won the first Mackay Trophy on October 9th, 1912. This trophy is awarded for outstanding achievement in the field of aviation and holds significant historical value in recognizing advancements and contributions made by aviators.

Hap Arnold's achievement in winning this trophy highlights his pioneering role in the development of United States military aviation and his influence on the formation of the modern air force. His contributions laid foundational elements for military air power, making the date of the award notable in aviation history.

The other dates provided do not correspond with the actual date of the award, which is key to understanding the timeline of aviation milestones and recognizing figures like Hap Arnold in aviation history.