Boeing has been awarded a major contract to lead the long-awaited upgrade of the Republic of Korea Air Force’s (ROKAF) F-15K Slam Eagle fleet, marking a significant step in Seoul’s effort to modernize its air combat capabilities amid a rapidly evolving regional threat environment. The contract follows the launch of the upgrade program by South Korea’s Defense Acquisition Program Administration (DAPA) in 2022 and the approval of a U.S. Foreign Military Sale (FMS) in November 2024.

Under the agreement, Boeing will design and develop an integrated suite of systems to bring the F-15K closer to the configuration of the U.S. Air Force’s latest F-15EX Eagle II, dramatically enhancing the aircraft’s long-range strike, survivability, and interoperability with allied forces. The contract is valued at $2.806 billion and represents the core development phase of a broader modernization effort estimated at $6.2 billion.

According to the contract notice published by the U.S. Department of Defense, the U.S. Air Force Life Cycle Management Center will act as the contracting authority on behalf of the ROKAF and DAPA. The work will be carried out primarily at Boeing’s facilities in St. Louis, Missouri, and is scheduled for completion by December 31, 2037.

While the end date extends beyond DAPA’s original planning window of 2024 to 2034, officials note that the revised timeline reflects delays in contract award and the scale of the design and integration work required. The FMS authorization approved in 2024 covered both the development work awarded to Boeing and the procurement of hardware and services required to upgrade the aircraft themselves.

The F-15K Slam Eagle has long been the backbone of South Korea’s heavy strike capability. Based on the F-15E Strike Eagle, the Korean variant was selected in 2002 after defeating the Rafale, Eurofighter Typhoon, and Su-35 in the highly competitive F-X fighter program. The initial order covered 40 aircraft equipped with General Electric F110-129 engines, followed by a second batch of 21 jets powered by Pratt & Whitney F100-PW-229 engines.

Of the 61 aircraft originally delivered beginning in 2005, South Korea currently operates 59. The fleet averages around 16 years of service and is expected to remain operational until roughly 2060, making the upgrade essential to maintain relevance against modern air defense systems and emerging threats.

The Slam Eagle name reflects the aircraft’s ability to employ the AGM-84H SLAM-ER stand-off cruise missile, a capability that distinguishes it within the ROKAF. It is also the only Korean fighter certified to carry the Taurus KEPD 350K long-range cruise missile, giving it unmatched reach and destructive power within the force.

The components requested under the FMS indicate South Korea’s intention to upgrade the entire F-15K fleet to a standard closely aligned with the F-15EX Eagle II. According to the Defense Security Cooperation Agency (DSCA):

• 96 Advanced Display Core Processor II (ADCP II) mission system computers
• 70 AN/APG-82(V)1 Active Electronically Scanned Array (AESA) radars
• 70 AN/ALQ-250 Eagle Passive Active Warning Survivability System (EPAWSS) electronic warfare suites
• 70 AN/AAR-57 Common Missile Warning Systems (CMWS)

This configuration would place the upgraded Slam Eagles among the most capable non-stealth strike fighters in the world, with digital processing power, sensor fusion, and survivability features comparable to those of newly built aircraft.

Interestingly, the Korean upgrade goes a step further than the current U.S. Air Force F-15EX configuration by including the AN/AAR-57 CMWS. This addition will require structural modifications to the aircraft, including the installation of sensor blisters along the canopy rails, underscoring that the F-15K upgrade is not merely a software refresh but a substantial physical transformation.

The FMS notice also includes provisions for aerial refueling support and aircraft ferry services, suggesting that at least the first aircraft may be flown to the United States for modification. The explicit mention of work being conducted in St. Louis reinforces the likelihood that early upgrades will take place at Boeing’s facilities before the process transitions to South Korea for the bulk of the fleet.

Such an approach would allow Boeing and the ROKAF to validate integration work on initial aircraft, reduce technical risk, and accelerate the learning curve before full-rate modification begins in country.

It remains unclear whether the F-15K will receive the full glass cockpit found on the F-15EX Eagle II. The EX features a 10-by-19-inch large area display touchscreen, Joint Helmet Mounted Cueing System II (JHMCS II) for both pilot and weapons systems officer, a low-profile head-up display, and a highly digitalized cockpit optimized for networked warfare.

Regardless of the final cockpit layout, the upgraded F-15Ks will be powered by the ADCP II, widely described as the fastest mission computer ever installed on a fighter aircraft. This processing power will support the Operational Flight Program Suite 9.1X, a customized software package designed to ensure interoperability between modernized Eagles and legacy F-15 variants operated by both South Korea and the United States.

A centerpiece of the upgrade is the AN/APG-82(V)1 AESA radar. Derived from the APG-63(V)3 used on modernized F-15Cs and the APG-79 fitted to the F/A-18E/F Super Hornet, the APG-82 offers dramatic improvements in detection range, target tracking, and multi-mode operation.

The radar can simultaneously track multiple air and surface targets, support high-resolution ground mapping, and share data across networks, enabling faster decision-making and cooperative engagement in complex battlespaces.

Complementing the radar is the AN/ALQ-250 EPAWSS electronic warfare suite. EPAWSS provides full-spectrum EW capabilities, integrating radar warning, geolocation, situational awareness, and self-protection functions into a single system. The upgrade will also increase chaff and flare capacity by 50 percent, with four additional dispensers installed in fairings behind the tail fins, bringing the total to 12 dispensers and 360 countermeasure cartridges.

Designed to operate in dense and contested electromagnetic environments, EPAWSS is intended to give the F-15K greater freedom of maneuver and deeper penetration capability against modern integrated air defense systems.

The inclusion of the AN/AAR-57 CMWS further enhances survivability. The system uses ultraviolet sensors to detect incoming missile launches, providing accurate threat localization and automatically cueing countermeasures. Although first fielded in 2005, the CMWS has been continuously upgraded, with Generation 3 algorithms now optimized to counter newer missile threats.

Together, the radar, EW suite, and missile warning system represent a significant leap in the Slam Eagle’s ability to survive and fight in high-end conflict scenarios.

The F-15K upgrade is part of a broader modernization of the ROKAF’s fighter fleet. In parallel, South Korea is upgrading its KF-16 Block 52 fighters to the V configuration, integrating new AESA radars, mission computers, and self-protection suites, with completion expected by 2025. These efforts complement the acquisition of the F-35A Lightning II and the ongoing development of the indigenous KF-21 Boramae.

South Korea’s decision to invest heavily in legacy platforms reflects the increasingly complex security environment it faces. North Korea continues to expand and diversify its ballistic missile arsenal, while China’s air force is rapidly modernizing with advanced fighters, long-range weapons, and sophisticated air defense systems.

In this context, the Slam Eagle remains the ROKAF’s primary long-range strike platform capable of carrying heavy stand-off weapons such as the Taurus KEPD 350K and SLAM-ER. While the F-35A and KF-21 bring stealth and advanced sensors, they currently lack equivalent stand-off strike capabilities in Korean service.

The KF-21 is expected to close part of this gap with the introduction of the Korea Air-Launched Cruise Missile (KALCM) under its Block 2 upgrade, with initial air-to-ground capability reportedly planned for mass-produced aircraft from 2027. Until then, and likely beyond, the F-15K will remain indispensable.

By aligning the F-15K’s configuration closely with the U.S. Air Force’s F-15EX, South Korea stands to gain significant interoperability benefits. With F-15EX deployments planned for Kadena Air Base in Japan, common systems and software will simplify joint training, logistics, and operational planning.

In a regional contingency, upgraded Slam Eagles could operate seamlessly alongside U.S. F-15EXs and F-35s, sharing data, coordinating strikes, and potentially serving as high-capacity “missile trucks” supporting stealth assets penetrating defended airspace.

The scale and ambition of the F-15K upgrade program signal South Korea’s intent to keep the Slam Eagle relevant well into the 2040s and potentially beyond. With advanced sensors, powerful mission computers, and state-of-the-art electronic warfare systems, the upgraded F-15K will be far more than a legacy platform—it will be a central pillar of South Korea’s deterrence and strike posture.

As the regional balance of air power continues to evolve, Boeing’s $2.8 billion contract represents not just a modernization effort, but a strategic investment in maintaining credible, long-range air combat capability in one of the world’s most volatile security environments.

The United States Navy has awarded Pratt & Whitney a contract valued at up to $1.6 billion to sustain the F135 propulsion system that powers all variants of the F-35 Lightning II, the world’s largest and most widely deployed fifth-generation fighter program. The agreement ensures continued global support for the rapidly expanding fleet operated by the United States and its international partners.

According to the Pentagon’s announcement, the undefinitized contract — capped at $1,606,190,091 — covers an extensive range of services running through November 2026. The funding includes cost, cost-plus-fixed-fee, cost-plus-incentive-fee, and fixed-price-incentive-fee components, reflecting the diverse technical and logistical requirements involved in sustaining one of the most complex military engines ever fielded.

Pratt & Whitney, a subsidiary of RTX, will provide comprehensive support for the F135 engine at both the unit and depot levels. The sustainment package includes global maintenance services, replenishment spare parts, software updates, engineering support, supply chain and material management, configuration and product management, propulsion integration, and security management. It also covers Joint Technical Data updates, support equipment management, and depot-level repair activities for all fielded propulsion systems across F-35 production plants and operational bases worldwide.

The Pentagon noted that the contract’s scope ensures “recurring sustainment support, program management, financial and administrative activities,” along with full-spectrum maintenance and logistics assistance crucial for a fleet with increasing sortie rates and expanding operational commitments. A total of $98,975,737 in obligated funds will expire at the end of the current fiscal year, underscoring the urgency attached to maintain uninterrupted support pipelines.

The F135 engine is the central propulsion system for the F-35A conventional takeoff variant, the F-35B short takeoff/vertical landing (STOVL) model, and the F-35C carrier-based variant. Operated by the U.S. Air Force, Navy, and Marine Corps, the engine also powers the jets flown by partner nations such as the United Kingdom, Italy, Japan, Australia, Norway, the Netherlands, and others participating in the Joint Strike Fighter program.

As of 2025, more than 1,000 F-35 aircraft have been delivered globally, with production and deployment accelerating across Europe and the Indo-Pacific. This growth has intensified demand for sustainment, supply chain resilience, and depot-level capacity, especially as more nations transition from initial operational capability to full operational use.

The F135 is widely regarded as one of the most technologically advanced and maintenance-intensive engines in U.S. military aviation. The F-35B’s unique STOVL lift-fan configuration and the F-35C’s higher-stress carrier operations add further complexity to sustainment demands. The engine’s performance requirements — including extreme thermal loads and high sortie rates — have led to recurring debates within the Pentagon over long-term modernization, upgrade pathways, and funding strategies.

Despite these challenges, the Pentagon continues to prioritize F135 sustainment to ensure fleet readiness and mission availability as the aircraft assumes a growing share of U.S. and allied airpower missions. The latest contract reflects ongoing efforts to stabilize the global support ecosystem and ensure a reliable flow of parts, maintenance, and technical updates.

Work under the contract is expected to be completed by November 2026, with services and repairs taking place across U.S. facilities and international F-35 operating locations.

As geopolitical tensions grow and allied air forces deepen their reliance on fifth-generation platforms, maintaining the F135 propulsion system has become critical to ensuring that the F-35 remains fully combat-ready. The new sustainment contract marks another major investment in the long-term, reliability, and global interoperability of the F-35 fleet.

In a landmark step for India’s defence sector, Hindustan Aeronautics Limited (HAL) on Wednesday signed its biggest-ever single contract, worth approximately ₹66,500 crore, with the Ministry of Defence to supply 97 additional Light Combat Aircraft (LCA) Tejas Mk1A fighter jets to the Indian Air Force (IAF).

The historic agreement cements HAL’s status as the backbone of India’s indigenous military aviation industry and marks a significant boost to the government’s long-standing push for self-reliance in defence, or Atmanirbharta.

“This is truly a red-letter day for HAL,” said Dr. D.K. Sunil, Chairman and Managing Director of the state-owned aerospace giant. “This order is not just a commercial milestone but a powerful recognition of the Tejas program and of India’s capability to design and produce world-class fighter aircraft.”

With the deal, the IAF’s fleet of Tejas Mk1A jets will expand significantly, enhancing both numbers and capability at a time when the force faces the twin challenge of replacing its ageing Soviet-era fighters while preparing for a new era of high-tech air warfare.

The ₹66,500 crore contract covers the production of 68 single-seat combat variants and 29 twin-seat trainers. Deliveries will begin in the 2027-28 financial year and will be phased over six years.

This order comes on the back of the previous contract signed in January 2021, under which HAL was tasked with supplying 83 Tejas Mk1A jets at a cost of ₹46,898 crore. The new deal not only raises the total number of Tejas jets on order to 180 Mk1A fighters, but also signals the IAF’s growing faith in the program.

Defence officials have called it one of the most important military aviation procurements in India’s history, surpassing in scale many earlier indigenous and import acquisitions.

A defining feature of the new contract is the push to raise the indigenous content of the Tejas to 70 percent. This will include critical systems such as the Uttam Active Electronically Scanned Array (AESA) radar, designed by the Defence Research and Development Organisation (DRDO), and a sophisticated electronic warfare suite developed by Indian industry.

“The work HAL is doing and the ecosystem we are building is an excellent example of how the government is walking the talk of Atmanirbharta,” Dr. Sunil said.

The move is expected to stimulate the domestic defence supply chain, creating jobs across small and medium enterprises, private firms, and research institutions. HAL officials estimate that over 500 Indian companies are already part of the Tejas ecosystem, ranging from avionics manufacturers to precision engineering suppliers.

By reducing dependency on foreign systems, India also seeks to shield itself from supply disruptions, sanctions, or geopolitical uncertainty.

The Tejas Mk1A is a significantly upgraded version of the baseline LCA Tejas, which was first inducted into the IAF in 2016 after decades of development.

The Mk1A variant introduces enhanced avionics, better maintainability, modern cockpit interfaces, and improved survivability systems. It will be capable of firing a wider array of advanced missiles, including the indigenous Astra beyond-visual-range air-to-air missile.

The incorporation of the indigenous Uttam AESA radar is particularly significant. AESA radars are the heart of modern fighter combat, offering greater range, resistance to jamming, and simultaneous tracking of multiple targets. Coupled with the electronic warfare suite, the Tejas Mk1A is expected to rival or surpass many contemporary fighters in its class.

The aircraft’s lighter frame, agility, and ease of maintenance have also been highlighted as advantages for operational deployment.

The IAF currently operates about 30 fighter squadrons, against a sanctioned strength of 42. With the gradual phasing out of the ageing MiG-21 Bison aircraft, which have been the mainstay of India’s fleet for decades, replenishing numbers is critical.

The induction of 97 new Tejas Mk1As is expected to significantly alleviate the shortfall, even as the IAF awaits the development of more advanced platforms such as the Tejas Mk2 and the Advanced Medium Combat Aircraft (AMCA).

“This order is a lifeline for the IAF’s modernization plan,” a senior defence official said. “It ensures that we do not face a critical gap in squadron strength while transitioning to next-generation fighters.”

The Tejas has already proven its operational reliability in multiple IAF exercises and deployments, including during the India-China standoff in Ladakh in 2020 when Tejas jets were forward deployed.

To power the new fleet, HAL has finalized a deal with General Electric (GE) for 113 F404 engines. While the Tejas program has faced criticism for reliance on imported engines, HAL officials note that efforts are underway to co-produce the F414 engines for the future Tejas Mk2 in India.

Dr. Sunil acknowledged past delays in engine delivery but expressed confidence that GE’s supply chain issues were being resolved. “GE’s top management is fully aligned with us now, and they have committed to ramping up production to meet our needs,” he said.

Analysts suggest that while reliance on imported engines remains a vulnerability, the broader localization of avionics, radar, weapons, and other systems offsets this concern to a large extent.

The ripple effects of the ₹66,500 crore order will extend far beyond HAL. Industry experts estimate that the program could generate tens of thousands of jobs across the Indian defence ecosystem, from engineering graduates to technicians on the shop floor.

HAL has already been expanding its production facilities, including a new assembly line in Nashik, to ensure timely delivery of the expanded order book.

The emphasis on local content will also benefit private firms such as Bharat Electronics Limited (BEL), Larsen & Toubro (L&T), and a host of micro, small, and medium enterprises (MSMEs).

“This is how an indigenous program becomes an industry-wide catalyst,” said a defence industry analyst. “It’s not just about HAL. It’s about creating a whole value chain that strengthens India’s defence readiness.”

The Tejas program has faced its share of skepticism. Conceived in the early 1980s to replace the MiG-21, the project suffered from long delays, design challenges, and shifting requirements. Critics often dismissed it as a symbol of India’s inability to deliver cutting-edge defence projects on time.

But the 2021 and 2024 mega-orders, and the IAF’s operational endorsement, mark a turning point. The aircraft is now not just an experimental project but the future backbone of India’s light fighter fleet.

“What we are seeing is a shift from doubt to confidence,” a retired Air Marshal observed. “The Tejas has crossed the bridge from development hell to operational credibility.”

Beyond domestic orders, the Tejas has attracted export interest. Countries in Asia, Africa, and Latin America have reportedly shown curiosity about the fighter, though no firm deals have yet materialized.

The Mk1A’s competitive price point, indigenous systems, and adaptability make it an attractive option for nations seeking affordable modern fighters without heavy geopolitical strings.

Officials suggest that successful large-scale induction into the IAF will be a strong advertisement for the jet’s export potential.

While the Tejas Mk1A fills an immediate gap, India’s long-term airpower strategy hinges on the Tejas Mk2 and the Advanced Medium Combat Aircraft (AMCA)—both under development.

The Mk2 will be a larger, more powerful multi-role fighter, while the AMCA is envisioned as a fifth-generation stealth fighter. Both programs are at critical stages of design and testing.

For now, however, the Mk1A order ensures continuity, confidence, and capability. It also provides the industrial experience and ecosystem strength needed to support more ambitious projects.

The ₹66,500 crore Tejas Mk1A order is more than just a defence contract. It represents a coming of age for India’s aerospace ambitions, a validation of decades of persistence, and a clear statement that the nation intends to control its own military destiny.

For HAL, it is both a challenge and an opportunity—to prove that it can deliver on time, at scale, and at global standards. For the IAF, it is a critical lifeline to keep its squadrons strong. And for India, it is a powerful symbol of Atmanirbharta taking flight.

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Causing anxiety

‘Unnecessary disruption’

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