Comac ARJ21-700 explained for airline operations

The Comac ARJ21-700 is China's first domestically developed turbofan regional jet, created to reduce the country's dependence on foreign aircraft in the 70 to 90 seat segment. The program emerged from a strategic national initiative under China's 10th Five Year Plan, targeting a market niche comparable to aircraft such as the Boeing 717 and the Embraer E190. Officially launched in March 2002 under the designation Advanced Regional Jet for the 21st Century, the project was initially managed by the AVIC Commercial Aircraft Company (ACAC), a consortium of Chinese aerospace entities. When the Commercial Aircraft Corporation of China (COMAC) was established in May 2008, development responsibility transferred to the new state owned manufacturer, headquartered in Shanghai.

The ARJ21-700 features a fuselage cross section closely resembling that of the McDonnell Douglas MD 80/MD 90 family, which had previously been assembled under licence in Shanghai. However, the aircraft incorporates a new supercritical wing designed by Ukraine's Antonov Design Bureau, featuring a 25 degree sweep angle and fuel saving winglets. The powerplant selected during the design phase was the General Electric CF34-10A high bypass turbofan engine, producing approximately 75.87 kN of thrust per unit. The flight deck is equipped with the Rockwell Collins Pro Line 21 integrated avionics suite, including five large LCD displays and the FMS 4200 flight management system.

Key Development Milestones

Original program targets called for a maiden flight in 2005 and entry into service around 2007, but the ARJ21-700 encountered significant delays driven by design complexities and manufacturing challenges. The first prototype was rolled out in Shanghai on 21 December 2007, roughly two years behind schedule. The maiden flight followed on 28 November 2008, when the first prototype (serial 101) took off from Shanghai. Three additional flight test prototypes joined the program between August 2009 and November 2010, accumulating thousands of test hours across stall, high speed, noise, and natural icing campaigns.

A notable setback occurred during 2010, when a wing box static test at Xi'an revealed structural cracking before the required load threshold was reached. This failure prompted additional engineering work and contributed to further certification delays. Emergency landing gear release issues, unresolved until March 2013, also prolonged the flight test campaign.

After route proving flights covering 10 airports and more than 170 hours, the Civil Aviation Administration of China (CAAC) granted Type Certification on 30 December 2014. The first aircraft (registration B-3321) was delivered to launch customer Chengdu Airlines on 29 November 2015. Commercial revenue service began on 28 June 2016, with Chengdu Airlines operating the inaugural route from Chengdu Shuangliu to Shanghai Hongqiao. CAAC certification for mass production followed in early July 2017, enabling a gradual ramp up toward a target of 30 aircraft per year from a dedicated production line at Shanghai Pudong.

By late 2024, over 146 ARJ21-700 aircraft had been delivered to approximately 11 Chinese carriers, including Air China, China Eastern, and China Southern, as well as Indonesia's TransNusa, the sole international operator. In November 2024, COMAC formally rebranded the type as the C909 at the Zhuhai Airshow, aligning the naming convention with its C919 and C929 programs. As of mid 2025, the ARJ21-700 has not obtained FAA or EASA type certification, limiting its operational footprint to carriers within China and select Asian markets. For passengers flying the type, a few practical adjustments can enhance the overall flight experience.

What Distinguishes the ARJ21-700 from Other ARJ21 Variants

The ARJ21-700 is the baseline passenger variant within the ARJ21 family and is offered in two configurations: a standard range (STD) version with a full payload range of approximately 1,200 NM (2,225 km) and an extended range (ER) version reaching around 2,000 NM (3,700 km) through increased operating weights and fuel optimisation. The stretched ARJ21-900 adds a fuselage section to seat 98 to 105 passengers, while the ARJ21F is a dedicated freighter variant capable of carrying up to 10,150 kg of cargo. A business jet variant, the ARJ21B, was also proposed with a VIP interior for approximately 20 passengers.

The following list summarises the verified identifiers that define the Comac ARJ21-700:

• Engines: Two General Electric CF34-10A turbofans (approximately 75.87 kN thrust each)
• Wing: Supercritical design by Antonov, 25 degree sweep, winglets, wing area of 79.86 m²
• Avionics: Rockwell Collins Pro Line 21 with FMS 4200
• Seating: 78 passengers in two class layout, up to 90 in single class
• Range: 1,200 NM (STD) / 2,000 NM (ER)
• Service ceiling: 11,900 m (39,000 ft)
• ICAO designator: AJ27
• Current designation: Rebranded as Comac C909 since November 2024

The Comac ARJ21-700 was developed as a short to medium range regional jet designed to serve domestic and regional routes across China and Southeast Asia. The aircraft features a configuration with rear fuselage mounted engines, a swept T-tail, and a low wing with a supercritical aerofoil designed with input from Antonov. With a 25 degree wing sweepback angle and integrated winglets, the design prioritises efficiency at cruise while retaining good performance from shorter runways and at higher altitude airports. The cabin adopts a five abreast (2+3) layout, offering 78 seats in a mixed class arrangement or up to 90 seats in an all economy configuration.

The ARJ21-700 exists in two main sub variants: the standard range (STD) and the extended range (ER). The ER version features increased maximum takeoff and landing weights and a greater usable fuel load, extending the operating range from approximately 1,200 nmi to around 2,000 nmi. Both sub variants share the same external dimensions and airframe architecture, making them broadly interchangeable in terms of ground handling and airport compatibility.

• Overall length: 33.46 m (109 ft 9 in)
• Wingspan (including winglets): 27.29 m (89 ft 6 in)
• Height: 8.44 m (27 ft 8 in)
• Wing area: 79.86 m²
• Typical seating: 78 (mixed class) to 90 (all economy, five abreast 2+3)
• MTOW (ER): 43,500 kg (95,901 lb)
• MLW (ER): 40,500 kg (89,287 lb)
• Maximum fuel capacity: approximately 13,231 litres / 10,386 kg usable
• Range (STD, with max payload): approximately 1,200 nmi (2,200 km)
• Range (ER, with full passenger load): approximately 2,000 nmi (3,700 km)
• Cruise speed: Mach 0.78 (approximately 828 km/h / 447 kn)
• Maximum operating speed: Mach 0.82
• Service ceiling: 39,000 ft (11,900 m)
• Engines: 2 × General Electric CF34-10A turbofans, 17,640 lbf (78.5 kN) each
• Takeoff field length (ER, MTOW, sea level, ISA): approximately 1,900 m
• Cargo capacity: 2,000 kg (4,409 lb) in underfloor compartments
• Avionics: Rockwell Collins Pro Line 21 integrated suite

Flight Systems, Avionics and Handling Technology

The ARJ21-700 uses a fly-by-wire flight control system supplied by Honeywell, making it one of the few regional jets in its segment to adopt this technology. The flight deck features five 10 by 8 inch high resolution liquid crystal displays and is built around the Rockwell Collins Pro Line 21 avionics suite, incorporating the FMS-4200 flight management system. This system supports vertical navigation, flight time and fuel planning, as well as standard instrument departures and terminal arrival routes. Communications rely on the VHF-4000 voice and data transceiver with VDL Mode 2 data link capability. The aircraft also integrates a Rockwell Collins solid-state weather radar, an AHS-3000 attitude heading reference system, traffic alert and collision avoidance system (TCAS), and a fully integrated Engine Indication and Crew Alerting System (EICAS). Engine control is managed through a Full Authority Digital Engine Control (FADEC) system, with the throttle control module provided by Kaiser Electroprecision interfacing with both the autopilot and autothrottle.

Published performance figures for the ARJ21-700 should be interpreted with care. Variations arise depending on the sub variant (STD or ER), cabin density, actual operating weight, atmospheric conditions, airport elevation, and runway surface state. For instance, takeoff field lengths published by COMAC assume sea level, ISA standard day conditions, dry runway, and zero wind. Real world values at high altitude or hot weather airports common across western China will differ significantly. Range figures similarly depend on the number of passengers, cargo load, and reserve policy applied by each operator.

General Electric CF34-10A: The ARJ21-700 Powerplant

The ARJ21-700 is powered exclusively by two General Electric CF34-10A high bypass turbofan engines. Each unit is rated at 17,640 lbf (78.5 kN) of takeoff thrust, flat rated to 30°C (86°F) at sea level. The CF34-10A features a bypass ratio of 5:1, an overall pressure ratio of 29:1, a fan diameter of 53 inches, and a dry weight of approximately 3,700 lb. GE provides the complete propulsion system for the ARJ21, including the nacelle, thrust reverser, and engine buildup unit for rear fuselage mounting.

The CF34 engine family traces its lineage to the military TF34 turbofan developed in the early 1970s. The TF34 powered both the Fairchild Republic A-10 Thunderbolt II close air support aircraft and the Lockheed S-3 Viking carrier based patrol aircraft. The civilian CF34-1A derivative entered commercial service in 1983 on the Bombardier Challenger 601 business jet. Subsequent variants expanded the family's reach considerably: the CF34-3 became the powerplant for the Bombardier CRJ100/200 and Challenger 650, while the CF34-8C and CF34-8E were developed for the CRJ700/900/1000 and Embraer E170/E175 respectively. The CF34-10E, a close sibling of the 10A, entered service on the Embraer E190/E195 and Lineage 1000 in 2005. The 10A and 10E represent the most powerful members of the CF34 family, incorporating technologies drawn from the CFM56, CF6, and GE90 programmes. The first CF34-10A ran on test in 2006 and subsequently received FAA certification. Across all variants, the CF34 family has accumulated over 209 million flight hours and more than 165 million cycles worldwide, establishing one of the most proven reliability records in the regional jet segment.

The Comac ARJ21-700, also known since late 2024 as the COMAC C909, is a short to medium range regional jet designed to serve routes up to 2,000 nm (3,700 km) in its extended range version, and up to 1,200 nm (2,200 km) at full passenger load in its standard variant. Typical missions last between 1.5 and 3.5 hours, connecting secondary cities to major hubs across domestic Chinese networks. With over 140 aircraft delivered by late 2024, the type has surpassed 10 million passengers carried and operates on hundreds of domestic and a handful of international routes.

The aircraft was conceived for hub and spoke operations, feeding traffic from smaller regional airports into major hubs such as Beijing Capital, Shanghai Hongqiao, Guangzhou Baiyun and Chengdu Shuangliu. Some operators also deploy it on point to point services linking secondary cities where demand does not justify a larger narrowbody. Takeoff field length requirements of approximately 1,700 to 1,900 m at sea level make it compatible with most regional airports, though operators report payload limitations at high elevation airfields. The aircraft is powered by two General Electric CF34 10A turbofan engines, mounted at the rear of the fuselage forward of the T tail, a configuration reminiscent of older regional jets such as the Bombardier Q400 era designs, though the ARJ21 is a pure jet rather than a turboprop.

Operational challenges include a relatively long takeoff distance compared to some competing regional jets, reduced payload capacity at hot and high airports (notably in western China and the Tibetan Plateau), and a still maturing global support and spare parts network outside mainland China. Daily utilisation patterns are typical of regional jets in Chinese domestic service, with airlines scheduling multiple short sectors per day to maximise revenue opportunities.

Where the Comac ARJ21-700 Operates: Airlines by Region

As of 2025, the Comac ARJ21-700 fleet is overwhelmingly concentrated in Asia, specifically mainland China, where every major carrier and several regional airlines have taken deliveries. International operations remain limited but are gradually expanding into Southeast Asia. There are currently no confirmed operators in Europe, North or South America, or Africa, though the Republic of Congo has reportedly placed an order. The aircraft has not received EASA or FAA type certification, which effectively limits its deployment to regions that accept the CAAC (Civil Aviation Administration of China) certificate or issue their own validation.

• Asia: This is the core region for the Comac ARJ21-700. In China, Chengdu Airlines serves as the launch customer, having operated the type since June 2016 on routes from Chengdu to Shanghai Hongqiao and across western China. Air China operates a substantial fleet on domestic services from Beijing and other hubs. China Southern Airlines uses the type on short haul routes including Guangzhou to Jieyang. China Eastern Airlines and its subsidiary OTT Airlines deploy the aircraft for regional connectivity from Shanghai. Other Chinese operators include Genghis Khan Airlines in northern China, China Express Airlines, and Jiangxi Air. Outside China, TransNusa in Indonesia became the first international operator in April 2023, flying routes such as Jakarta to Kuala Lumpur and Jakarta to Johor Bahru. Lao Airlines in Laos has received at least one aircraft. VietJet in Vietnam began operating two wet leased ARJ21s from Chengdu Airlines on domestic Vietnamese routes in 2025.
• Europe: No airlines in Europe currently operate the Comac ARJ21-700. The absence of EASA type certification means the aircraft cannot be registered or commercially operated within European airspace under European regulatory frameworks.
• North and South America: There are no known operators or firm orders for the Comac ARJ21-700 in North America or South America. Without FAA certification, commercial operations in the United States, Canada, or any territory recognising FAA standards remain impractical.
• Africa: No confirmed operators exist in Africa. Reports indicate the Republic of Congo placed an order, but no deliveries or active operations have been documented as of 2025.

Typical Seating Configurations on the Comac ARJ21-700

The Comac ARJ21-700 features a five abreast cross section arranged in a 2+3 layout, narrower than typical single aisle narrowbodies but consistent with regional jet standards. According to the COMAC Aircraft Characteristics for Airport Planning document, the manufacturer offers three baseline cabin configurations: a 90 seat all economy layout, a 78 seat mixed class arrangement (8 business and 70 economy), and a high density option seating up to 97 passengers.

In practice, the vast majority of operators choose the 90 seat all economy configuration. Air China, China Southern Airlines, China Eastern Airlines and OTT Airlines all use this layout with seat pitch ranging from 30 to 31 inches (76 to 79 cm) and a seat width of approximately 17 inches (43 cm) between armrests. The mixed class layout with 78 seats offers business class passengers a 36 inch pitch in a 2+2 arrangement at the front of the cabin, while economy seats behind have a 32 inch pitch. However, no Chinese or international operator has been widely documented using this two class configuration in regular scheduled service. Detailed seat maps for China Eastern's C909 fleet confirm the standard single class arrangement with emergency exit rows offering additional legroom. Passengers seated in the rear rows may experience higher cabin noise due to the aft mounted engine placement.

The Comac ARJ21-700, now officially rebranded as the C909, has accumulated a notably clean safety record since entering commercial service in June 2016 with Chengdu Airlines. With over 170 aircraft delivered by late 2025 and operations spanning more than nine years across multiple Chinese carriers and a handful of international operators, the type has recorded zero fatal accidents. According to the Aviation Safety Network database, only one incident has been formally logged for the ARJ21 fleet as of early 2026. For an aircraft programme still in relative youth compared to established Western competitors, this track record places the ARJ21-700 among the cleaner slates in modern regional aviation.

Context matters when interpreting these figures. The fleet is considerably smaller than those of the Embraer E-Jet family or the Bombardier CRJ series, and the vast majority of operations take place on domestic Chinese routes under the oversight of the Civil Aviation Administration of China (CAAC). A smaller fleet logging fewer cumulative flight hours naturally produces fewer statistical opportunities for incidents. Nonetheless, the absence of any hull loss or fatal event across thousands of daily revenue flights is a positive indicator.

Notable Incidents Involving the ARJ21-700

The sole recorded safety event for the type occurred on 18 August 2025, when a China Express Airlines ARJ21-700 (registration B-657V, flight G54504) experienced a runway excursion at Kashi Laining International Airport (KHG) in Xinjiang, China. The aircraft, arriving from Shache Yeerqiang Airport, touched down abnormally during a go around and reportedly veered off the right side of the runway before returning to the paved surface. The aircraft sustained minor damage and, crucially, no occupants were injured. The CAAC launched an investigation into the event, though detailed findings and formal safety recommendations had not been made public at the time of writing. The Aviation Safety Network entry for this incident notes that available information is currently limited to unofficial sources.

Because no other accidents or serious incidents have been attributed to the ARJ21-700 in operational service, there is no additional event history to report. During the extended flight test programme prior to certification, prototype aircraft completed over 5,000 flight hours, including more than 8,200 stall test sorties and natural icing trials, which helped identify and address aerodynamic and systems vulnerabilities before the type entered airline service.

How Safe Is the Comac ARJ21-700?

Evaluating the safety of any aircraft type requires looking beyond raw incident counts. The ARJ21-700 was certified by the CAAC under CCAR-25-R3, a regulatory standard broadly equivalent to the FAA's FAR Part 25 and EASA's CS-25 for transport category aeroplanes. Its design incorporates dual General Electric CF34-10A turbofan engines, a supercritical wing with a 25 degree sweep and winglets, a T-tail configuration, and Rockwell Collins Pro Line 21 avionics featuring a quiet and dark cockpit philosophy that reduces pilot workload and enhances situational awareness. These features reflect a conventional yet proven approach to regional jet design.

Operators of the ARJ21-700 follow standard operating procedures (SOPs) aligned with CAAC regulations, and the aircraft benefits from continuous airworthiness management overseen by its manufacturer, COMAC, in coordination with the CAAC. Pilot training programmes use full flight simulators, and aeronautical medicine standards for crew fitness further support safe operations. From a regulatory perspective, CAAC oversight covers type certification, production approval (granted in 2017), and ongoing surveillance of both the manufacturer and operators.

At the global level, the IATA 2025 Safety Report recorded 51 accidents among 38.7 million flights worldwide, resulting in an all accident rate of 1.32 per million sectors. The fatal accident rate improved to one fatal event per roughly 4.8 million flights. These industry wide figures confirm that commercial aviation remains one of the safest modes of long distance transport. The ARJ21-700, with no fatal accidents and only one minor incident across its operational history, currently sits well within the safer end of this spectrum. As the fleet grows and accumulates more flight hours, ongoing monitoring by CAAC and transparent reporting will be essential to maintaining this record.