China on course to win the fifth-generation fighter race? J-20 fleet reaches 500 as Beijing ramps up production while US struggles to scale F-35 output

China's race to dominate the skies is no longer just about developing advanced stealth fighters, it's increasingly about building them faster than anyone else. While the United States still fields the world's largest fleet of fifth-generation combat aircraft, recent estimates suggest Beijing has quietly reached a manufacturing milestone that could fundamentally alter the balance of air power in the Indo-Pacific over the next decade.

The People's Liberation Army Air Force (PLAAF) is now believed to operate around 500 Chengdu J-20 Mighty Dragon stealth fighters, making it the world's second-largest fifth-generation fleet after the United States. More importantly, analysts believe China is preparing to dramatically expand production, potentially manufacturing up to 400 J-20s annually by 2027, a pace that would significantly exceed current production of Lockheed Martin's F-35 Lightning II, as reported by The National Interest.

The numbers alone do not determine military superiority, but they reveal a broader trend: China has shifted from proving it can build a stealth fighter to demonstrating it can mass-produce one.

China's J-20 production has accelerated at an unprecedented pace

When the J-20 first appeared during taxi tests in late 2010, many Western observers viewed it as an experimental aircraft rather than the foundation of a large-scale stealth fighter programme. That perception has changed dramatically.

The aircraft entered PLAAF service in late 2016 and has steadily evolved with improved avionics, indigenous engines, advanced weapons and even a twin-seat variant designed for specialised missions.

Military production figures in China remain classified, but multiple independent assessments now converge around a similar estimate.

According to long-time Chinese military aviation researcher Andreas Rupprecht, cited by The War Zone, approximately 500 J-20s had likely been delivered by mid-2026. The fighter is now operated by at least 14 frontline PLAAF brigades, along with multiple flight test and training units, indicating that the aircraft has become the backbone of China's premier air combat force.

The UK's Royal United Services Institute (RUSI) has estimated that J-20 production reached roughly 120 aircraft annually by late 2025. Meanwhile, analysts increasingly believe Beijing is expanding production infrastructure that could eventually support annual output approaching 400 aircraft, although such figures remain projections rather than officially confirmed production rates.

The United States still leads, but the gap is narrowing

Despite China's rapid progress, the United States retains a commanding lead in operational fifth-generation aircraft.

Lockheed Martin has produced more than 1,300 F-35 Lightning II fighters since the programme began, making it by far the world's most widely produced stealth combat aircraft.

In 2025 alone, the company delivered 191 F-35s, the highest annual production figure in the programme's history.

The US military, as reported by The National Interest, currently operates approximately:

• Around 500 F-35A conventional fighters with the Air Force
  
• Roughly 110 F-35C carrier variants with the Navy
  
• Between 235 and 255 F-35B/C aircraft with the Marine Corps
  

That gives the United States an operational fleet of roughly 850 F-35s.

In addition, the US Air Force still flies approximately 185 F-22 Raptors, although only 143 are combat-coded, with the remainder assigned to testing and training. Like most advanced fighters, a portion of the fleet is unavailable at any given time due to maintenance.

Combined, America possesses well over 1,000 operational fifth-generation fighters, still substantially ahead of China's current inventory.

Why analysts say China is winning the production race

Where Beijing appears to be gaining ground is not necessarily in technology but in manufacturing momentum.

Unlike the United States, which produces F-35s for more than a dozen allied countries alongside domestic orders, every J-20 built goes directly into PLAAF service.

The absence of export commitments allows China to focus entirely on expanding its own combat inventory.

The J-20 is also being produced by China's state-owned aerospace sector under a centrally directed industrial strategy, enabling Beijing to prioritise military manufacturing without balancing commercial export requirements.

The United States must divide F-35 production among domestic services and numerous foreign customers including NATO members, Japan, South Korea, Australia, Israel and Singapore.

Should projected production rates materialise, China could eventually produce J-20s at roughly twice today's F-35 annual output.

Also, earlier J-20 variants relied on Russian-designed engines. Today's aircraft increasingly feature China's indigenous WS-10C, while future versions are expected to receive the more powerful WS-15 engine, reducing reliance on foreign suppliers.

How the J-20 compares with America's F-35 and F-22

Although both aircraft belong to the fifth-generation category, they were designed for different missions.

The F-35 Lightning II is a multirole strike fighter emphasising sensor fusion, networked warfare and precision attack. Its three variants allow conventional, carrier and short take-off operations.

The F-22 Raptor remains America's premier dedicated air-superiority fighter, optimised for dominance in air-to-air combat.

China's J-20 Mighty Dragon occupies a somewhat different niche. It is significantly larger than both American fighters, offering greater internal fuel capacity and longer combat range. Its design prioritises long-range interception and beyond-visual-range combat, supported by large internal weapons bays capable of carrying advanced PL-15 long-range air-to-air missiles.

While the J-20 is generally believed to have lower all-aspect stealth characteristics than the F-22 or F-35, continual upgrades have narrowed capability gaps in sensors, avionics and propulsion.

Is China really winning the fifth-generation fighter race?

The answer depends on how the race is measured.

If judged by technology, combat experience, allied interoperability and total operational fleet size, the United States remains comfortably ahead. It operates the world's largest fifth-generation force, backed by decades of combat testing, global logistics networks and highly trained pilots.

If judged by manufacturing momentum, however, China has emerged as the fastest-growing fifth-generation air power.

The PLAAF has transformed the J-20 from a closely watched prototype into a force of around 500 operational aircraft in less than a decade. Independent analysts believe the fleet could approach 1,000 aircraft by 2030 if current production trends continue.

Yet even that may not define the next era of air combat.

By the early 2030s, attention is expected to shift toward sixth-generation aircraft, including the US Air Force's F-47, China's next-generation combat aircraft now undergoing testing, and the multinational Global Combat Air Programme (GCAP) being developed by the United Kingdom, Japan and Italy.