The Mitsubishi Regional Jet (MRJ) has been delayed five times and faces rising costs, yet its future as the vanguard of Japanese-built passenger jets seems assured by the corporate muscle behind it and a government set on reviving an aerospace industry dismantled after World War Two.
The delays - the new 90-seat plane was due to take off in 2013, but the first delivery is not now seen until 2020 - have dented its chances of commercial success as established regional jet makers, Brazil's Embraer SA and Canada's Bombardier Inc, catch up with its innovations, and China and Russia flex their aerospace ambitions.
But the Japanese government's primary goal isn't to make money for Mitsubishi Aircraft, the MRJ's manufacturer, rather it's to have the plane cement an industry revival that failed to take off half a century ago with Japan's last passenger plane, the YS-11.
"Rather than a simple question of whether it makes a profit or loss, what is more important is will it over the longer term be the foundation of a strong aerospace industry," a government source who is helping the programme told Reuters. He asked not to be identified as he is not authorised to talk to the media.
Presentation documents prepared by the Ministry of Economy, Trade and Industry, seen by Reuters, see the MRJ as the first in a three-generation programme stretching beyond 2060.
With the plane still awaiting US-standard certification for commercial flights, signed-up customers are banking on the backing of big-name Japanese companies to see the project through.
Mitsubishi Aircraft Corp is 64 percent-owned by Mitsubishi Heavy Industries, with Toyota Motor Corp and Mitsubishi Corp each holding a 10 percent stake. Other shareholders include state-owned Development Bank of Japan, Sumitomo Corp and Mitsui & Co.
"Not a bad list," says Jep Thornton, a partner at Aerolease Aviation in Florida which has ordered 10 of the planes. "This is coming from the government sector, the financial sector and the investor sector."
Launch customer ANA Holdings, Japan's biggest carrier, says it won't walk away from its order for 15 MRJs even as it has to keep older aircraft flying and leases four Boeing 737-800 aircraft to make up for a capacity shortfall.
"We want this plane in our fleet and although we have been on stand-by for a while, we await it with anticipation," said Yuji Hirako, who runs All Nippon Airways.