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【正文】 ting larger and larger. Quite a few airplanes now can carry over 300 passengers. And the air itself bees more and more crowded. ( Section A綜合運用 ) If one giant airliner hit another in midair, 600 lives could be lost. From the moment an airliner takes off② to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilots exactly when to turn, when to climb, and when to e down. ( Section A綜合運用 ) The air traffic controllers around a busy airport like London Heathrow may deal with 2, 500 planes a day. Not all of them actually land at the airport. Any plane that f
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