The Massachusetts Port Authority's fire chief says the 173 passengers and 11 crew members had already gotten off the jet when a mechanic spotted smoke at about 10:45 a.m. Monday.
The mechanic was the only person on board at the time and no one was hurt.
Chief Bob Donahue says he thinks the fire in the jet's auxiliary battery system started after the airplane had already landed at Logan International Airport. He says it was quickly brought under control.
Japan Airlines began nonstop service between Boston and Tokyo's Narita Airport using the new Boeing 787 in April.
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