Final answer:
The immediate impact of Charles Lindbergh's solo flight was the rapid growth of the aviation industry, with advancements in technology and a surge in the popularity of air travel. Lindbergh became an international hero, symbolizing the potential of the American spirit of innovation.
Step-by-step explanation:
The greatest immediate impact of Charles Lindbergh's successful solo flight across the Atlantic was a significant boost to the aviation industry. His flight in the Spirit of St. Louis demonstrated the potential of air travel and, as a result, the airline industry began to flourish during the 1930s. Advances in technologies, including more efficient engines and comfortable passenger compartments, contributed to the increased popularity of air travel. By the end of the decade, the number of domestic air passengers in the U.S. increased from just over 450,000 to nearly two million annually.
Lindbergh's feat also had a profound impact on public perception, as he became an international hero and a symbol of American ingenuity and courage. His flight challenged and dispelled doubts about the feasibility of long-distance air travel, proving the skeptics wrong and inspiring a wave of enthusiasm for aviation among the public and potential investors alike.