What important aviation event occurred in 1903?

The Wright Brothers flew their first plane in 1903, marking a significant milestone in aviation history. This event represents the first successful powered flight of a heavier-than-air aircraft, specifically the Wright Flyer, piloted by Orville Wright. The flight lasted 12 seconds and covered 120 feet, demonstrating the practicality of controlled flight and laying the foundation for modern aviation.

The other options refer to events that occurred either much later or involve innovations that didn't take place until decades after the Wright Brothers' achievement. For instance, the first manned moon landing happened in 1969, the invention of the helicopter was developed in the 1930s, and jet engines were being conceptualized and developed in the 20th century but not until after the Wrights’ initial breakthrough. Therefore, the correct answer highlights a foundational moment in transportation history that fundamentally changed the course of technology and transportation.