Japan Airlines has seen two of its Boeing 787 Dreamliners returned to base after developing technical faults.
These are the latest in a series of mishaps for the maligned aircraft.
One of the planes, on route two Tokyo from San Diego, saw two anti-ice systems, which prevent ice building up around the engine, fail.
An electrical glitch on a flight from Moscow to Tokyo made six toilets unusable.
The failure resulted in six of the seven toilets on the plane not being able to flush.
In January, Japan Airlines saw its entire Dreamliner fleet temporarily grounded.
That move was prompted after a fire broke out on one a Dreamliner operated by the airline, and an All Nippon Airways flight was forced to make an emergency landing because of a battery fault and a fire in one of the electrical compartments.
In July, a fire broke out on a 787 jet operated by Ethiopian Airlines while it was parked at Heathrow airport.
Then in August, ANA said it had found damage to the battery wiring on two 787 locator transmitters during checks.
In a perhaps related move, JAL announced a $9.5 billion plane deal with rival Airbus earlier this week.
It is the first time that it has agreed to buy Airbus planes, having preferred Boeing for many decades.