The crash of Egypt Air Flight 804, which terrorists may have downed over the Mediterranean Sea, provides another tragic reminder of why.

埃及航空公司的804次航班坠毁的悲剧再一次提醒人们为什么要这么做，那次航班可能是在地中海上空被恐怖分子击落的。

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Birds use warm air currents to help their flight.

鸟利用暖气流助飞。

《牛津词典》

He signed up as a flight attendant with Korean Air.

他与大韩航空公司签了约，当机乘员。

《柯林斯英汉双解大词典》

The most recent threat nearly got away. The 30-year-old Pakistani American was on board this flight, bound for Dubai when pilots heard this from Air Traffic Control: Federal agents stopped the flight and removed Shahzad, who managed to board the airplane despite being placed on a "no-fly" list hours before.

VOA: standard.2010.05.06

Air power enthusiasts had been making that claim continuously since the Wright Brothers proved the feasibility of heavier-than-air flight in 1903, so by the time the new millennium rolled around there were plenty of people in the Air Force ready to believe it.

FORBES: Air Force Positions For Resurgence In Pacific Era

Anderson added that Delta, which owns Northwest, has followed all guidelines set by the government since the 1996 mid-air explosion of TWA Flight 800 -- which killed all 230 people aboard -- and the September 11, 2001, terror attacks.

CNN: STORY HIGHLIGHTS

But it is worth remembering that just over a century ago, heavier-than-air flight seemed an impossible dream.

ECONOMIST: Electric planes