America is over 94 times bigger than South Korea. America is such a large country that it is not difficult to understand why ar travel is so popular. In fact more than half the world's airline passengers are Americans. Over 420 million people a year fly from one place to another within the United States alone. O'Hare International Airport in Chicago is the world's busiest airport. At O'Hare Airport, an average of fifty planes land and take off every hour. That is nearly one plane a minute!

Flying can be expensive, but most U.S.A. airlines offer cheaper fares if you buy your ticket a few weeks before your flight. You can call an airline to get information about flights and to buy a ticket. If you pay for your ticket with a credit card, the airline will mail it to you. However, traveling by air is not the only to travel in America.