21).Making Airline Reservations 预定飞机票            You can go to a travel agency or talk directly to the airlines to             make air travel arrangements. Remember that some cities have more             than one airport. Be sure you know which airport and terminal your             flight leaves from.            1.A: I want to fly to Chicago on Thursday, the 1st.            B: Let me see what's available.            A: I want to go coach, and I'd prefer a morning flight.            B: United's Flight 102 leaves at 9:20.            A: That's fine. What time do I have to be at the airport?            B: Check-in time is 8:45.            2.A: I'd like to make a reserbation to Los Angeles for next Monday.            B: Just a second and I'll check the schedule.            A: I'll need an economy ticket with an open return.            B: TWA has a fight leaving at 9:25.            A: I guess that's OK. What time should I check in?            B: You have to be there half an hour before departure time.            3.A: What flights do you have from New York to London tomorrow?            B: One moment, please, and I'll find out what's available.            A: I'd like to travel first-class.            B: OK. We have a nonstop flight leaving Kennedy at 9:25.            A: When should I get to the airport?            B: Please be there by 8:45 at the latest.            4.A: Do you fly to Dallas on Sunday?            B: Just a minute and I'll see if there are any flights.            A: By the way, I don't want a night flight.            B: There's a DC-10 out of LaGuardia Airport at 9:15.            A: When am I supposed to check in?            B: Try to be there by 8:15-the airport will be crowded