British Airways flight drops 27,000 feet, returns to London

A British Airways flight dropped about 27,000 feet in 10 minutes while en route from London en route to Chicago on Monday, according to flight data.
The plane started the descent from 36,000 feet to 9,000 feet about 30 minutes after it departed London, tracking data from FlightAware shows. It appeared to be a controlled descent.
A spokesperson for British Airways said there was a technical issue and that the aircraft later landed safely.
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