Sources: Mitsubishi won't deliver SpaceJet in 2020

The company behind Japan's first domestically developed passenger jet has yet again decided to delay delivery of its plane. NHK has learned Mitsubishi Aircraft doesn't expect to get the jet to customers until next year or later.

The company was conducting flight tests in the US to obtain safety certification, aiming for delivery around the middle of this year.

But sources say there were issues with the electronic system. This forced a design change, and held back completion of the test aircraft. The government inspection is also said to be taking longer than expected.

This is the sixth time Mitsubishi Aircraft has postponed delivery, which was originally scheduled for 2013.