Thu, 14 June 2007 06:54:34 PDT Boeing to assist Mitsubishi on jet San Diego Union-Tribune: Boeing Co. has agreed to cooperate with Mitsubishi Heavy Industries Ltd. on Japan\’s first passenger jetliner. Mitsubishi\’s jetliner will come in 72-seat and 92-seat versions and is part of a larger effort by Japan to develop aircraft that are more fuel-efficient and make less noise.