两个起飞从厄堡和3月21日，1999年，他们在埃及降落瑞士村，有前往二万八千四百三十一英里。
The two took off from the Swiss village of Chateau d'Oex and on March 21, 1999, they landed in Egypt, having traveled 28,431 miles.
飞机得在达到一定的速度以后，才能有足够的提升力从地面起飞。
An aeroplane has to reach a certain speed before there is enough lift to get it off the ground.
航空公司可能也很难协调客机的起飞时间和目的地，使它们能够从编队飞行中获益。
It might also be hard for airlines to co-ordinate the departure times and destinations of passenger aircraft in a way that would allow them to gain from formation flight.
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