Two airline fleets are checking the troubled Boeing 787 Dreamliner for new wiring problems unrelated to battery defects that plagued the aircraft earlier this year.
All Nippon Airways said the departure of a 787 plane was delayed over problem wiring for a system to put out engine fires.
A spokeswoman said it found two similar problems while inspecting its other 787s.
Dreamliner jets were grounded worldwide in January for lithium-ion batteries that overheated or caught fire. Flights resumed four months later after a revamped battery system was installed.