United Flight 175 from Denver to Tokyo was diverted to Seattle on Tuesday . The unscheduled landing was ` ` due to an investigation of a problem with an oil filter '' 787s returned to service this year after battery troubles grounded them for several months . The unscheduled landing occurred the same day United ordered 20 new Dreamliners .
United Flight 139 from Denver to Tokyo was diverted to Seattle on Tuesday . The unscheduled landing was `` due to an indication of a problem with an oil filter '' 787s returned to service this year after battery troubles grounded them for four months . The unscheduled landing comes the same day United ordered 20 new Dreamliners .