KAAN vs F-35 Lightning II: Full Technical Comparison of Fifth-Generation Fighters

The F-35A is the product of decades of low-observable engineering, with a carefully managed radar cross-section, internal weapons carriage, embedded antennas and a maintainable stealth coating refined across more than a thousand airframes. Its signature management is backed by an exhaustive electronic intelligence library and operational data gathered in real combat, making it the benchmark for survivable penetration of contested airspace. For NATO planners, the F-35’s stealth is a known, validated quantity that integrates seamlessly into allied strike packages.

KAAN is designed from the outset as a stealth platform, with an internal weapons bay, chined fuselage and angular planform aimed at a reduced frontal signature. As a twin-engine design it is physically larger than the F-35 and emphasizes air superiority, with the airframe still in early flight testing. Its clean-sheet design lets Turkey embed contemporary lessons in signature management, but the actual radar cross-section remains unproven and the low-observable maintenance ecosystem is yet to mature. On demonstrated stealth performance the F-35 retains a decisive edge.

The F-35’s sensor fusion is arguably its defining strength: the AN/APG-81 AESA radar, Electro-Optical Targeting System and the 360-degree Distributed Aperture System feed a single fused picture to the pilot, while Multifunction Advanced Data Link sharing turns every jet into a node of a networked kill web. This fusion, hardened across operational deployments, lets the F-35 act as a sensor and battle manager for legacy fleets, a capability NATO air forces increasingly build their doctrine around.

KAAN centers its avionics on a fully indigenous suite: ASELSAN’s MURAD AESA radar, the KARAT infrared search-and-track and the TOYGUN electro-optical targeting system, with a roadmap toward manned-unmanned teaming controlling ANKA-III and KIZILELMA. A sovereign architecture allows rapid, license-free software updates and customer-specific tailoring. However, this sensor-fusion ecosystem is at an early integration stage and has not been validated in operations. KAAN offers a fresh, sovereign foundation; the F-35 wins on proven, deeply fused combat avionics.

KAAN is currently flying on two General Electric F110-GE-129 engines, the same class powering F-15s and F-16s, giving the twin-engine fighter substantial installed thrust and a measure of redundancy that single-engine designs lack. The strategic objective is the indigenous TF35000 afterburning turbofan, targeted at roughly 35,000 lbf, which would free the programme from foreign engine controls. Twin-engine architecture and a high max takeoff weight position KAAN as a large, kinematically capable air-superiority airframe, though its definitive engine is still in development.

The F-35A relies on a single Pratt & Whitney F135 delivering around 43,000 lbf in afterburner, the most powerful fighter engine in widespread service, enabling Mach 1.6 and a combat radius beyond 1,240 km on internal fuel. Its propulsion is mature, mass-produced and globally supported, albeit subject to U.S. export controls and with an upgrade path through the Engine Core Upgrade. KAAN’s twin-engine layout offers redundancy and growth, but the F-35’s single F135 is a fully proven, sustained-production powerplant; on validated propulsion the F-35 leads.

The F-35 is a NATO and allied standard, operated by the United States, United Kingdom, Italy, Netherlands, Australia, Norway, Denmark, Canada, Belgium, Poland, Finland, Israel, Japan, South Korea and others, with well over a thousand aircraft fielded. That scale delivers economies of production, a vast spares and training pipeline, and guaranteed coalition interoperability. Its drawbacks are a high through-life cost and the political conditionality of U.S. release, which is precisely the gap Turkey is moving to fill.

KAAN has secured no export deliveries yet, but interest has been signalled at international shows, and Ankara targets initial operational capability and the first Block-10 jets toward 2028-2030. Its appeal lies in offering a fifth-generation alternative without Washington’s transfer restrictions, with the prospect of technology transfer and co-production for partners shut out of the F-35. For export customers seeking strategic autonomy, KAAN is a compelling proposition, but on maturity, fielded numbers, interoperability and proven export success the F-35 dominates by a wide margin; KAAN competes on sovereignty and future potential.

On today’s maturity the F-35A is clearly superior: it is in service with more than twenty operators, has proven stealth and combat-tested sensor fusion, and is backed by global production and support. KAAN is a promising indigenous fifth-generation fighter with a sovereign avionics suite, but it is still in prototype flight testing, has no operational record and no export deliveries yet.

Not yet. The prototypes fly on General Electric F110-GE-129 engines, the same class used by F-16s and F-15s. Turkey is developing the indigenous TF35000 afterburning turbofan, targeted at around 35,000 lbf, to power production aircraft and remove dependence on foreign engines.

KAAN made its first flight on 21 February 2024 and remains in prototype flight testing. Turkey targets initial operational capability around 2028 and aims to deliver the first batch of roughly twenty Block-10 jets between 2028 and 2030, subject to test and engine milestones.

KAAN is designed as a stealth platform with an internal weapons bay and a low-observable planform, but its radar cross-section is unproven and its stealth-maintenance ecosystem is immature. The F-35’s signature management is validated across more than a thousand airframes and in real operations, so it retains a decisive edge for now.

Mainly for strategic autonomy: KAAN offers a fifth-generation option without U.S. export restrictions, with the prospect of technology transfer and co-production. It is attractive to states excluded from the F-35 or seeking sovereign industrial capacity, in exchange for accepting lower maturity and a support network that is only beginning to form.