PARIS/TOKYO -- At the Paris Air Show in June 2007, Mitsubishi Heavy Industries unveiled a sleek, gleaming silver mock-up of an aircraft it hoped would conquer the world's regional jet market. Twelve years and billions of dollars in overruns later, the Japanese conglomerate was back in Le Bourget this week, rebooting a program that was billed as the fulfillment of a national and corporate dream but instead became an investor nightmare.





