War work again brought local prosperity during World War II, this time centered on <answer>Boeing</answer> aircraft. The war dispersed the city's numerous Japanese-American businessmen due to the Japanese American internment. After the war, the local economy dipped. It rose again with <answer>Boeing</answer>'s growing dominance in the commercial airliner market. Seattle celebrated its restored prosperity and made a bid for world recognition with the Century 21 Exposition, the 1962 World's Fair. Another major local economic downturn was in the late 1960s and early 1970s, at a time when <answer>Boeing</answer> was heavily affected by the oil crises, loss of Government contracts, and costs and delays associated with the <answer>Boeing</answer> 747. Many people left the area to look for work elsewhere, and two local real estate agents put up a billboard reading "Will the last person leaving Seattle – Turn out the lights."
What company's downturn drastically effected Seattle's economy?
Boeing