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Tokyo • It's almost four years late in arrival, leaving customers including Utah-based SkyWest Airlines waiting.

But now, with a helping hand from bullet-train specialists, Japan is finally ready to show its first passenger jet to the world.

Mitsubishi Aircraft Corp. will unveil the regional jet at Nagoya on Saturday after three delays as customers such as ANA Holdings Inc. and SkyWest await delivery. Mitsubishi is building 78- and 92-seater planes and plans to conduct its first flight by the end of June. The larger model will come out first.

Japan and China are leading the Asian race to break the virtual duopoly of Embraer and Bombardier in the small-passenger-jet market. With the Chinese aircraft also delayed, Mitsubishi's regional jet will be a test of whether a new entrant can successfully break into the small group of leading plane manufacturers. Boeing and its European rival Airbus Group lock out the market for larger passenger planes.

"The rollout is a positive development, particularly useful for marketing," said Richard Aboulafia, a vice president of Teal Group, a Fairfax, Virginia-based consultant. "The MRJ order book is a good start for a new player." Still, "the MRJ program needs to prove that it can be competitive even up against the market leader."

Mitsubishi Aircraft wants to take half of the global market for regional aircraft over the next 20 years as Bombardier focuses on its new CSeries jets, which will be able to carry as many as 160 passengers. The CSeries program is also delayed.

The world fleet of jets seating 70 to 130 passengers will increase to about 6,580 by 2033, from 3,850 last year, as travel demand increases, according to forecasts from Embraer. The Brazilian company is also upgrading its jets with new engines to an E2 family to take advantage of rising demand.

China and Russia are also competing for regional jet orders. China will deliver its first ARJ21-700 jets to Chengdu Airlines by the end of this year, as long as the planes get airworthiness certificates, the China Daily said in December.

Russia's Sukhoi SuperJet 100, built by a joint venture between Moscow-based United Aircraft Corp.'s Sukhoi and a unit of Italy's Finmeccanica SpA, started flying commercially with Aeroflot in 2011.

One advantage Mitsubishi has is its orderbook. The company has orders, including options, for 407 jets. Three more airlines became customers this year, taking the total tally to six. ANA is the launch customer.

Mitsubishi Aircraft, based in Nagoya, brought in rail project managers from parent Mitsubishi Heavy Industries Ltd. to tighten control of the regional jet development. The company has boosted the number of engineers on the project by 30 percent to 1,300, President Teruaki Kawai said earlier this year. The moves are to help prevent development bottlenecks that have slowed the plane's introduction by about four years.

Mitsubishi announced in 2008 it would start building Japan's first passenger jet and has pushed back the date for test flights three times since then. The company expects global demand for regional jets to be about 5,000 planes over the two- decade period to 2030.

Japan's Honda Motor Co. is also developing a smaller jet plane that can seat up to six people and is set to be delivered to customers next year. The company, which will compete with business jets, says it's won two-to-three years of orders for what it calls "flying sports cars."