It has almost four years late in arriving. Now, with a helping hand from bullet train specialists, Japan's first passenger jet is about to make its debut.

Mitsubishi Aircraft Corp. will unveil the plane in Nagoya on Saturday after three delays as customers such as ANA Holdings Inc. and SkyWest Inc. await delivery.

The company is building 78- and 92-seat versions of the plane, called the Mitsubishi Regional Jet, and plans to conduct the first flight by the end of June. The larger model will come out first.