Initially, the Boeing 787 Flight VN37 was scheduled to leave Noi Bai at 11 pm on Friday, but it was then delayed until 2:36 am the next day after technical warnings related the plane’s wings.

An airplane of Vietnam Airlines
However, 30 minutes after the departure, another technical problem was detected related to the backup power generator; so the captain decided to return Noi Bai.
After the landing, Vietnam Airlines used another Boeing 787 for the replacement. The flight safely arrived at Frankfurt.
Following inspection, the faulty aircraft has resumed operation.
Vietnam Airlines apologised and the affected people were provided with alternative flights.