Shortly after the wright brothers made their historic first flights, the skies began to fill with aircraft. At first, these aircraft were limited to short flights in clear weather due to the hazards to navigation. Aircraft used transportation routes to navigate by, even flying low to the railroads during reduced visibility, coining the phrase “hugging the UP” in reference to the Union Pacific lines. Early pilots began making personal notes to help them navigate to and land at increasingly distant airports. In fact, selling these notes to other pilots was the beginning of what would become an aeronautical information corporation for Elrey Jeppesen. But even with the best information and charts, air travel was still limited by visibility. In the 1930’s, radio technology got a foothold in aeronautical navigation, providing pilots with the ability to navigate farther distance through unfamiliar surroundings, even in reduced visibility. In 1941, the first instrument approach and landing charts were developed, serving pilots with the need to land in low visibility.