The travel and tourism industry in the United States was among the first commercial casualties of the September 11 attacks , a series of terrorist attacks on the U.S. Terrorists used four commercial airliners as weapons of destruction , all of which were destroyed in the attacks on New York City , Washington , D.C. , and in Pennsylvania with nearly 3,000 deaths . In the first full week after flights resumed , passenger numbers fell by nearly 45 percent , from 9 million in the week before September 11 to 5 million . Hotels and travel agencies received cancellations across the world . The hotel industry suffered an estimated $ 700 million loss in revenue during the four days following the attacks . The situation recovered over the following months as the Federal Reserve kept the financial system afloat . The U.S. Congress issued a $ 5 billion grant to the nation 's airlines and $ 10 billion in loan guarantees to keep them flying
September 11 attacks
September 11 attacks
Tourism in the United States