Delta Air Lines flight from Seattle to Shanghai mysteriously turned back and returned to the United States nearly six hours into what should have been an 11 hours flight to China. The mid-air flight cancellation has resulted in a rebuke from the Chinese consulate in San Francisco which said on its WeChat account that it had “lodged a protest” with the airline. Delta has since cancelled its planned service from Seattle to Shanghai until December 30 at the earliest but it remains unclear why the airline was forced to turn around in the first place. According to witnesses on the...