Engineers clean the Concorde before her take-off at London's Heathrow Airport. The world's only supersonic airliner, which first took to the skies in 1969, will make its final commercial flight.

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图为工程师们在伦敦希思罗机场为即将起飞的协和飞机作保洁。此架协和飞机为世界上惟一的商用超音速客机，首飞于1969年，即将执行最后一次商务飞行。