A fifth Boeing Dreamliner fault has been discovered in as many days, raising more fears over the aircraft's safety.
Oil was discovered leaking from the left engine of a Boeing 787 Dreamliner flight operated by All Nippon Airways (ANA) on Friday.
An ANA spokeswoman said the leak was found after the domestic flight landed safely at Miyazaki airport in southern Japan.
It came on the same day another Japanese 787 suffered a cracked cockpit window while in flight on a domestic route.
ANA said crew noticed a spider web-like crack in a window in front of the pilot's seat about 70 minutes into Friday's flight, which was close to its destination.
The Dreamliner, the world's first carbon-composite airliner, which has a list price of $207m (£128m), has been beset by problems this week.
Boston fire crews attend the JAL plane after it filled with smoke According to Reuters, US transportation officials will hold a news conference at 2.30pm GMT to discuss issues related to recent problems on the new plane.
Other reports said aviation officials would review the engine systems and reliability on long-haul transocean routes.
The Dreamliner was designed to use power plants made by General Electric and Britain's Rolls-Royce.
On Wednesday, a domestic flight was halted by ANA because brake parts to the rear left undercarriage needed replacing, a spokesman at Yamaguchi Ube Airport said.
A Japan Air Lines (JAL) jet was also grounded at Boston Logan International airport in the US following an engine fuel leak.
About 40 gallons of fuel spilled from the jet that was supposed to be bound for Tokyo.
That event followed the first incident of the week, which also occurred at Boston, on Monday.
Emergency services had been called after another JAL 787 filled with smoke shortly after passengers and crew had disembarked.
An investigator in the US examines a Boeing 787 Firefighters used infrared cameras to locate the fire in a battery pack in the belly of a different Boeing 787 and extinguished the blaze within 20 minutes.
The 787 Dreamliner made its first commercial flight in late 2011, after a series of production delays put deliveries more than three years behind schedule.
By the end of last year, Boeing had sold 848 Dreamliners, and delivered 49. JAL and ANA operate 24 of the planes.
After the Boston events, British carriers including BA, Virgin Atlantic and Thomson Airways reaffirmed their plans to integrate 787s into fleets this year and next.
In India - where state-owned Air India has taken delivery of six Dreamliners and has more on order - a senior official at the aviation regulator said there was concern at the recent spate of 787 glitches.
The Directorate General of Civil Aviation has not ordered any Dreamliner checks for now, but is waiting for a safety report from the US National Transportation Safety Board, the official said.
Meanwhile, an Air India spokesman said the airline's debut Dreamliner flight from India to Paris on Thursday went without a hitch.
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