SHANGHAI — A state-owned aircraft maker said Wednesday it is ready to deliver China’s first homegrown regional airliner and should complete a bigger plane in 2018.

The first two of the ARJ21-700 regional jets have been completed for a Chinese carrier, Chengdu Airlines, and are coming to the end of the certification process, according to Commercial Aircraft Corporation of China. The company said it has 252 orders.

China launched the ARJ21 project in 2002 in an attempt to break into the Western-dominated aircraft market. The plane was promised for 2007 but delivery was pushed back because of technical problems.

China is expected to become one of the world’s biggest aircraft markets over the next two decades. Boeing forecasts total demand at 5,580 planes worth a total of $780 billion.

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The ARJ21-700 can seat 78 to 90 passengers, with a range of 1,300 to 2,300 miles. Comac said it successfully completed test flights in North America in March and April.

The company is targeting China’s domestic market and flights to Southeast Asia. “We first want to develop our business in China and then gradually we will go to the international market,” Comac executive Tian Min said at Comac’s assembly and manufacturing center in Shanghai.

Comac’s larger C919 is a single-aisle jet meant to compete with Boeing and Airbus. It can seat up to 168 passengers and has a planned range of 2,500 to 3,200 miles.

The C919 is an official initiative “for China to recapture the value in aircraft manufacturing that currently goes offshore to Airbus and Boeing,” said industry analyst Will Horton of CAPA Centre for Aviation. “With such a large objective, accomplishments will come gradually.”

The company has received 400 orders from 16 customers, including aircraft-leasing company GE Capital Aviation Services. Low-cost carrier Ryanair and British Airlines have signed memorandums of understanding about their intention to purchase planes, Tian said.

He wouldn’t disclose price but said developers were focused on controlling costs.

Most orders have come from China’s state-owned airline industry under government instructions to support the program.

“Global aviation remains pessimistic on the C919, given the ARJ21 delays,” Horton said.

On May 15, the first front fuselage of a C919 was delivered Comac, Tian said. He said the plane will be assembled in the second half of 2014, and its maiden flight is due at the end of 2015. The first delivery slated for 2018.

Longer term, Comac is cooperating with Russia to build a next-generation widebody plane. The two sides signed a memorandum of understanding Tuesday during Russian President Vladimir Putin’s visit to China.

From its beginning in 2008, Comac has focused on developing the two passenger planes. It has grown from 3,800 employees to 8,300.

Earlier news reports said the C919 maiden flight was due in 2014, with delivery in 2016. Tian said those reports were wrong, and Comac always planned for its maiden flight to be 90 months from the project launch.