这架跨大西洋的英国航空航班从伦敦希思罗机场飞往芝加哥，发出7700紧急代码并迅速下降了28,000英尺。
The transatlantic British Airways flight, operating from London's Heathrow to Chicago, had issued a squawk 7700 code and rapidly descended 28,000 feet.
印度斯坦时报
骤降28,000英尺，空中飞行超4小时：英国航空航班因“技术问题”返航伦敦28,000 ft drop, over 4 hrs in air: British Airways flight lands back in London after 'technical issue'
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