With more than 300 J-20s and an estimated production rate of 120 aircraft a year, Beijing is shifting the balance of air power against the United States and its allies.
In summary
China is no longer merely developing a stealth fighter intended to symbolically rival the United States. It is now building the Chengdu J-20 on an industrial scale. The International Institute for Strategic Studies estimates that more than 300 aircraft have been delivered. The Royal United Services Institute estimates the recent production rate at around 120 aircraft per year, compared with around 20 in 2020. This acceleration gives Beijing the largest fleet of low-radar-signature fighter aircraft in the Asia-Pacific region. The J-20 remains difficult to assess. Its stealth capabilities, radar, engine and software are largely classified. It has never been deployed in combat. However, its range, long-range missiles and integration with KJ-500 radar aircraft already make it a serious threat. Its rise also marks a historic shift: China, once dependent on Russian aeronautical technology, now possesses a fighter aircraft industry far more dynamic than Moscow’s.
The Chinese fleet has crossed a strategic threshold
The Chengdu J-20 ‘威龙’, or Wēilóng, is no longer a rare aircraft reserved for a few elite units. It is now in service with a growing number of regiments within the People’s Liberation Army Air Force (PLAAF).
In 2020, China is reported to have had around 50 J-20s. Five years later, open-source estimates put the operational fleet at over 300 J-20s, spread across at least 13 regiments. The IISS confirmed in February 2026 that the threshold of 300 aircraft delivered had been exceeded. China thus possesses the largest fleet of low-radar-signature fighters in the Asia-Pacific region.
This change in scale is more significant than the exact number of aircraft available on any given day. Some of the aircraft delivered are used for pilot conversion, testing or training. Some are probably awaiting their final deployment. Not all are immediately combat-ready.
But the order of magnitude is no longer in dispute. The J-20 is now in mass production, integrated into operational units and supported by a mature industrial base. It forms the high-end core of the Chinese air force, alongside the J-16, J-10C and J-16D electronic warfare aircraft.
Any comparison with the United States must remain accurate. The US Air Force took delivery of the 500th F-35A built for it in July 2025. It also retains its fleet of F-22As. China therefore does not yet possess the world’s leading stealth air force. It does, however, have one of the largest and the only one currently growing at a comparable rate within the same heavy-class category.
Production rates exceed previous Western estimates
Production is reported to have increased sixfold since 2020
The most worrying information for Washington is not just the current size of the fleet. It is the speed at which it is growing.
According to the Royal United Services Institute, Chengdu was producing around 20 J-20s per year in 2020. By the end of 2025, the combined production rate of the new J-20A and J-20S variants is estimated to have reached around 120 aircraft per year. This is an estimate based on serial numbers, sightings of the aircraft and developments in industrial facilities. Beijing does not publish either its annual production volumes or its production costs.
This estimate should therefore be treated with caution. It is, however, consistent with the rapid increase in the number of regiments being converted and with the expansion of Chengdu’s assembly capacity.
The increase is considerable. Producing 120 fighter aircraft per year theoretically means completing one aircraft every three days. Even taking into account aircraft intended for testing, reserves and training, this rate allows for the rapid replacement of older units equipped with J-7s, J-8s, Su-27s or J-11s.
China is no longer seeking merely to possess a few high-performance aircraft. It is gradually building a mass-produced stealth fleet.
Industrial capacity is changing the balance of power
An air force is not judged solely by the quality of its best aircraft. It depends on its ability to cope with accidents, losses, technical downtime and wear and tear.
In a protracted war, a country capable of delivering around a hundred modern fighter aircraft a year has a structural advantage. It can replace lost airframes, build up its reserves and upgrade its aircraft without interrupting deliveries.
China’s official defence budget stands at 1,910 billion yuan in 2026, equivalent to approximately 277 billion dollars at the exchange rate announced in March. This represents a 7 per cent increase on the previous year’s actual expenditure. The precise cost of the J-20 programme remains a secret. It is likely spread across several budgets covering procurement, engines, research, infrastructure and missiles.
This lack of transparency prevents any meaningful comparison of the unit cost with that of the F-35 or the F-22. Public estimates of the price of a J-20 are too widely varied to be reliable. The verifiable fact lies elsewhere: China is simultaneously funding the J-20, the J-35, the J-16, radar aircraft, refuelling aircraft, combat drones and several next-generation demonstrators.
The J-20 prioritises range, stealth and first-strike capability
The airframe reveals a heavy fighter designed for the Pacific
The J-20 is a heavy twin-engine jet approximately 20.3 to 20.5 metres long. Its wingspan is estimated at between 12.9 and 13.5 metres.
Its maximum take-off weight is thought to be between 34 and 37 tonnes. These figures remain estimates, as China does not publish a complete operational technical specification.
The aircraft is therefore significantly larger than an F-35A. This size provides it with a large internal volume for fuel, sensors and armament. It is specifically designed to cover the distances involved in the Indo-Pacific.
The J-20 must be capable of operating over the Taiwan Strait, the East China Sea and beyond the first line of islands. It can be based within Chinese territory, under the protection of air defence systems, whilst retaining the capability to reach distant areas.
Public estimates of its range vary widely. It is more prudent to describe it as an aircraft optimised for operational depth rather than to specify a precise combat radius. Its in-flight refuelling capability further extends this range.
Stealth is probably most effective from the front
The J-20 features supersonic-diverting air intakes, internal weapon bays and streamlined surfaces to reduce radar reflections. Its missiles can be carried without external pylons, which preserves its stealth.
Its exact stealth performance is unknown. There are no credible publicly available figures allowing a direct comparison of its radar cross-section with that of an F-22 or an F-35. Claims that its canard wings negate any stealth capability are overly simplistic. A radar signature depends on the aircraft’s overall shape, the materials used, the frequency employed, the angle of observation and the quality of manufacture.
The J-20 appears to be optimised primarily to reduce its frontal radar cross-section. Its rear section and the circular nozzles on certain versions are likely to be less stealthy. This trade-off is consistent with an interception mission: closing in on an adversary, firing from a long range, then disengaging before being pinpointed.
The newer versions appear to benefit from better assembly and a more consistent standard of manufacture than the early aircraft. Stealth does not depend solely on the initial design; it requires tight tolerances, correctly fitted hatches and precisely maintained coatings.
The missiles give the J-20 its true power
The J-20 has a large ventral weapons bay and two small side bays. The configuration observed in flight generally comprises four PL-15 air-to-air missiles in the main bay and two short-range PL-10s in the side bays.
The PL-15 missile is a central component of the system. The Chinese version uses an active radar seeker and offers a greater range than many currently deployed versions of the AIM-120 AMRAAM. Its exact operational range remains classified.
The future, more compact PL-16 could enable the J-20 to carry six missiles in its central bay. The much larger PL-17 is designed to engage high-value targets such as radar aircraft, reconnaissance aircraft and refuelling aircraft. It is currently mainly associated with the J-16, which can carry it externally.
This architecture shows that the J-20 is not designed solely to engage fighters in close-quarters combat. Its mission may be to threaten the aircraft that make the entire US air operation possible.
Destroying or driving off a KC-46A tanker, an E-3 radar aircraft or a maritime patrol aircraft may have a greater impact than shooting down a single fighter. Without refuelling and advanced surveillance, the F-35s and US Navy aircraft must reduce their range or operate with less information.
The sensor system matters more than top speed
The J-20 is equipped with an AESA (Active Electronically Scanned Array) radar. It is also believed to have electro-optical sensors, infrared detectors and passive systems capable of detecting enemy emissions.
The exact performance of the radar is unknown. The US Air Force’s China Aerospace Studies Institute points out that Chinese publications refer to very long ranges, but that detection range alone is not sufficient to gauge the quality of a radar. Resistance to jamming, tracking accuracy, computing power and data fusion are equally important.
Above all, the J-20 should be understood as a node within a network. It can receive information from ground-based radars, satellites, other fighter aircraft and KJ-500 early warning aircraft.
RUSI estimates that China could have around 50 KJ-500s by the end of 2025, in addition to KJ-200s and KJ-2000s. These aircraft enable a J-20 to remain undetected by limiting the use of its own radar. It can receive a tracking signal, position itself and fire without immediately revealing its presence through a powerful transmission.
This detection chain is more important than the maximum speed listed in a technical specification. The fighter that spots the target first, shares the information most quickly and fires first often has the advantage.
The Chinese engine ends a long-standing dependence
The first batches of the J-20 used Russian AL-31 engines. China had not yet fully mastered modern turbojet engines capable of delivering high thrust, a long service life and consistent production.
Subsequent versions adopted the Chinese WS-10C. The future WS-15 engine is expected to offer greater thrust, improve acceleration and enable more impressive supercruise – that is, the ability to maintain supersonic speed without afterburner.
The exact status of the WS-15 remains difficult to ascertain. Test aircraft and certain new variants appear to be fitted with it, but there is no public evidence that the engine has already been installed on a large scale across all units.
Its significance extends beyond raw performance. A more powerful engine also provides greater electrical power and cooling capacity. These resources are essential for powering radar, jammers, computers and future weapons systems.
The rise in the capabilities of Chinese engines is significantly reducing Moscow’s leverage. Between 2016 and 2025, turbojet engines still accounted for a significant proportion of China’s military imports, the vast majority of which came from Russia. This relationship is diminishing as Beijing replaces the AL-31 and D-30 engines with domestically produced ones.
The J-20 cannot yet be declared superior to the F-22
Direct comparisons between the J-20, the F-22 and the F-35 often generate more noise than analysis.
The F-22 probably remains superior in terms of supersonic manoeuvrability, overall stealth and propulsion maturity. The F-35 boasts a proven data fusion system, a multinational architecture and real-world operational experience.
The J-20 has other advantages. It is large, has a substantial internal fuel capacity and carries missiles designed for long-range combat. It also benefits from an industry capable of rapidly scaling up production.
The main problem with any assessment remains the lack of combat experience. China has not deployed its J-20s against modern air defences, stealth fighters or high-intensity electronic warfare.
Exercises are progressing. Chinese crews are now conducting more complex missions involving fighters, bombers, refuelling aircraft, radar aircraft and naval units. But an exercise can never fully replicate the confusion, losses and communication breakdowns of a real war.
Technical readiness is another unknown factor. Producing 300 aircraft does not mean being able to deploy 300. Pilots, mechanics, missiles, spare parts, hangars and the capability to maintain the stealth coatings are all required.
The Taiwan scenario gives the J-20 its primary role
The J-20 comes into its own in an operation around Taiwan. The distance between Chinese bases and the theatre of operations is limited. The aircraft can operate without having to rely systematically on in-flight refuelling.
The US Department of Defence believes that China’s Joint Sword exercises have demonstrated the PLAAF’s ability to deploy large numbers of modern aircraft around Taiwan. The J-20 and J-16 provide a combination of range, safe-range weaponry and detection capabilities. The KJ-500s enhance surveillance and coordination.
In the event of a conflict, the J-20s could protect H-6 bombers, provide cover for electronic warfare aircraft, intercept US reinforcements or search for support aircraft.
They could also force the US to keep its refuelling and radar aircraft at a distance. Even without shooting them down, this threat would reduce their effectiveness. A refuelling aircraft forced to retreat several hundred kilometres reduces the time fighter aircraft can spend in combat.
In such circumstances, numbers matter directly. A few J-20s can be outmanoeuvred or concentrated in a single area. Several hundred allow for sustained patrols, the protection of various routes and the maintenance of reserves.
The Russian partnership strengthens Beijing without forming a joint air force
The relationship remains strategic but asymmetrical
China and Russia are deepening their military cooperation. They organise bomber patrols, naval exercises and joint manoeuvres. The CSIS recorded at least 119 joint exercises between 2003 and April 2026.
However, this relationship remains a strategic partnership, not an alliance. No treaty obliges Beijing to defend Moscow or Russia to intervene in a war over Taiwan. The Pentagon’s 2025 report highlights the absence of mutual guarantees and the persistence of mistrust regarding sensitive technologies.
Nor is there any public evidence of operational integration between the Chinese J-20s and the Russian Su-57s. Joint patrols mainly involve H-6s and Tu-95s. These serve to demonstrate political alignment and to force US, Japanese and South Korean forces to monitor multiple directions.
The strategic impact remains very real. Sino-Russian cooperation forces the United States to plan for the possibility of two simultaneous theatres: a crisis in Europe and another in the Indo-Pacific.
China has moved from being a customer to a dominant power
In the 1990s and 2000s, the modernisation of the Chinese air force depended largely on Russia. Beijing purchased around 270 Su-27s and Su-30s between 1990 and 2005. These contracts, estimated at between 10 and 11 billion dollars, provided aircraft, engines and crucial industrial know-how.
That era is coming to an end. China continues to use technologies inspired by or derived from Russian systems, but it has now mastered the design of stealth airframes, AESA radars, active-seek missiles and increasingly high-performance engines.
A comparison between the J-20 and the Su-57 sums up this shift. Moscow is producing its stealth fighter at a modest rate. Beijing is potentially manufacturing ten times as many J-20s per year. Russia retains superior operational experience. China now possesses the industry, the electronics and the production volumes.
The balance of dependence is even beginning to shift. Russian industry is increasingly relying on Chinese machine tools, electronic components and dual-use products. Moscow remains a source of expertise and certain specialised technologies, but it is no longer the main driving force behind China’s air force modernisation.
The United States must respond to an industrial threat
The US response cannot be limited to developing an aircraft superior to the J-20. It must take into account airbases, refuelling aircraft, missiles, spare parts stocks and the speed at which losses can be replaced.
The F-22 and F-35 retain significant advantages. The United States also has allies, extensive experience of joint operations and high-level training. However, its forces must cover immense distances from Guam, Japan, Australia and aircraft carriers.
China will fight close to its bases. It will benefit from land-based radars, air defences, ballistic missiles and a substantial support infrastructure. It will be able to concentrate its forces within a smaller area.
The J-20 is therefore forcing the US Air Force to accelerate several programmes: the F-47, the Collaborative Combat Aircraft drones, the AIM-260 missile, the B-21 bomber and operations dispersed from secondary bases.
Allies are also responding. Japan is increasing its orders for the F-35 and developing the Global Combat Air Programme with the United Kingdom and Italy. Australia is strengthening its strike and surveillance capabilities. Taiwan is dispersing its aircraft and improving its air defences.
The real game-changer lies in the factories of Chengdu
The J-20 does not need to be superior to the F-22 in every respect to shift the military balance. It must be sufficiently stealthy, sufficiently well-armed and numerous enough to complicate all enemy operations.
Its weaknesses are real. Its performance remains unclear. Its most advanced engine has yet to prove its maturity. Its crews have never faced a modern adversary. Its chain of command could prove inflexible in an unpredictable war.
But these reservations must not obscure the fundamental shift. In five years, China has gone from around fifty technologically nascent J-20s to a fleet of over 300 aircraft, backed by a potential production rate of 120 units per year.
Western air superiority once rested on a technological lead substantial enough to compensate for smaller fleets. Beijing is now challenging both elements of this equation. It is narrowing the technological gap and increasing production volumes.
In a protracted war, the quality of the first aircraft matters. The capacity to replace them matters even more. It is in this industrial arena, far more than in aerial displays, that the J-20 is becoming a major strategic problem for Washington.
Sources
Royal United Services Institute, The Evolution of Russian and Chinese Air Power Threats, 8 January 2026.
International Institute for Strategic Studies, The Military Balance 2026 and opening remarks by Bastian Giegerich, February 2026.
United States Department of Defence, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2025, December 2025.
China Aerospace Studies Institute, A Look at the J-20 AESA Radar, 28 July 2025.
China Aerospace Studies Institute, PLA Aerospace Power Primer, fifth edition, May 2026.
Centre for Strategic and International Studies, How Deep Are China-Russia Military Ties?, updated 2026.
Centre for Strategic and International Studies, Does China’s J-20 Rival Other Stealth Fighters?
Ministry of National Defence of the People’s Republic of China, Chinese Military Spokesperson Details 2026 Defence Budget, 10 March 2026.
United States Air Force, ‘125th Fighter Wing Receives First Permanently Assigned F-35’, 21 August 2025.
FlightGlobal, ‘World Air Forces 2026’.
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