A Taiwanese supplier of components for Japan's new regional passenger jet said Thursday it plans to complete essential work in the second quarter of this year, hoping to bring the aircraft closer to production configuration before its projected entry into service in 2020.

A specialist at the Taichung plant of the Aerospace Industrial Development Corp. said workers have been toiling around the clock to redesign and manufacture the slat and belly fairing of the Mitsubishi Regional Jet.

"We hope to complete the job in the second quarter," he said on condition of anonymity.