A United Airlines flight from San Francisco to Hong Kong made an emergency landing after a burning smell filled the cabin. A United spokesperson told Business Insider in an email statement that UA 869, a Boeing 777 aircraft carrying 336 passengers and 15 crew, returned to SFO "to address a burning rubber smell in the cabin." "The flight taxied to the gate where emergency personnel met the aircraft," the statement said, adding that passengers alighted normally and would be taken to Hong Kong on