According to reports, the plane developed a problem with one of the engine’s oil filters.
‘United Airlines flight 139 landed safely at Seattle-Tacoma International Airport shortly after 5 p.m. mountain time. The nonstop flight from Denver International Airport to Narita International Airport took off at 1:19 p.m.’
There were no injuries reported. Passengers were put on other flights to Tokyo.
The emergency landing comes just one week after the launch of the direct route from Denver to Tokyo. The launch date was for the much-heralded flight was pushed back twice due to problems with the Boeing 787 Dreamliner, which was plagued with problems and was grounded for several weeks while Boeing sought a solution to its battery problems.