Airports are not always named after the city they are in.New York City has two international airports: John F. Kennedy and LaGuardia. Chicago’s international airport is called O’Hare, and there is another for flights within the U.S. called Midway. The same with Washington D. C.. The airport in Boston is Logan. In Seattle you’ll find SeaTac, from Seattle and the name of neighboring city, Tacoma.There are four time zones in the U.S.. If you have to fly through several time zones in 12 hours or less, you may feel an upset of your body clock after the long flight. This is jet lag (时差). Doctors say the best thing you can do is rest on the plane and perhaps have a drink of water and rest at your hotel when you arrive.You can bring a total of one quart of alcoholic beverages (含酒精的饮料) and one carton (纸盒) of cigarettes into the U.S. duty free. If you bring more, you have to pay tax. If you lose something on the plane or cannot find your baggage at the claim area, you should report it to your airline. If you lose something in the airport, you should go to the lost and found.