Photo taken on Dec. 28, 2020 shows an ARJ21 jetliner of One Two Three Airlines (OTT Airlines) before performing its first flight in Shanghai, east China.(Xinhua/Ding Ting)

China's ARJ21 regional jetliner hit a record high annual delivery of 24 aircraft in 2020, according to the Commercial Aircraft Corporation of China (COMAC) Tuesday.

As of the end of 2020, COMAC had delivered a total of 46 ARJ21 aircraft, said the Chinese commercial plane maker, also the developer of C919 single-aisle passenger aircraft.

The China-developed regional jetliner model has entered a phase of accelerated batch delivery and large-scale commercial operation.

COMAC has delivered ARJ21 airplanes to six Chinese airlines: Air China, China Eastern Airlines, China Southern Airlines, Chengdu Airlines, China Express Airlines, Jiangxi Air and Genghis Khan Airlines.

As of the end of 2020, these ARJ21 jetliners have safely carried around 1.6 million passengers, COMAC said.

ARJ21 is China's first turbofan regional passenger jetliner. Designed with a capacity of 78 to 90 seats and a range of 3,700 km, it can fly in alpine and plateau regions and adapt to varying airport conditions.

As a pioneer of Chinese commercial airplanes, the ARJ21 was put into commercial service by Chengdu Airlines in June 2016.

The ARJ21 has achieved accelerated deliveries, with two planes delivered in 2017, six in 2018, and 12 in 2019.

The progress of ARJ21 ensues from the persistent support and efforts of China's civil aviation authorities in the airworthiness certification works, according to the Civil Aviation Administration of China (CAAC).

The CAAC vowed to enhance the quality and safety supervision of ARJ21 in mass production, delivery and commercial operation phases.