Japan Airlines Dreamliner flight to Tokyo returns to Boston with possible fuel pump problem One of two battery fires that grounded the 787s for three months broke out on a Japan Airlines plane in Boston in January after passengers had exited. The next day, another Japan Airlines 787 leaked fuel at Logan. The airline said an open valve caused a tank to overflow through a vent. The 787 is the newest and highest-profile plane from U.S.-based Boeing Co., which has said it stands behind its safety and overall integrity.