Mitsubishi Heavy Industries, the company developing Japan's first ever passenger jet, announced on Friday that it had received an order for up to 100 planes from US carrier Trans States.
Mitsubishi said it had signed a letter of intent with Trans States Holdings for the big order, of which 50 are confirmed and the remainder options.
"This is a very proud moment for us," Hideo Egawa, president of Mitsubishi's aircraft division, told a news conference.
It is the second order for the 70-90 seat Mitsubishi Regional Jet, which aims to meet growing demand for fuel-efficient planes. Launch customer All Nippon Airways is buying up to 25 of the jets.