Key Points and Summary – The F-35I Adir is the Israeli Air Force’s unique and highly customized version of the F-35 stealth fighter.
-Unlike any other U.S. ally, Israel was given unprecedented autonomy to modify the jet’s core software, avionics, and electronic warfare systems.
-This allows the F-35I to integrate with Israel’s own networks and carry unique, Israeli-made munitions like SPICE precision-guided bombs.
-The “Adir” has been proven in combat with dramatic results, most notably in strikes against Iran where it successfully destroyed advanced Russian-made S-300 air defense systems.
The F-35I Adir Explained
The F-35I “Adir” is the Israeli Air Force’s highly specialized variant of the Lockheed Martin F-35 Lightning II. The customized jet shows the high degree of autonomy Israel has been given by the United States, which allowed Israel to modify the stealth fighter’s software and avionics.
No other country has been allowed to modify the stealth fighter.
Avionics and Software
The F-35I features a raft of electronic modifications, including to the plane’s electronic warfare systems, command and control systems, mission planning software, and other custom sensors. The unique capabilities, which include Israeli-developed datalinks and custom helmet-mounted display features, allow the F-35I to integrate with Israeli network architecture rather than being dependent on U.S. software protocols and updates.
The United States has not provided access to the source code of core mission systems to anyone except the Israelis, and possessing that knowledge allows for better integration with Israeli-made systems and quicker adaptation to regional threats — a high priority given that Israel’s threat environment can change drastically in the space of just a night.
Weapons Integration
The IAF’s F-35Is can also carry Israeli-designed munitions such as the SPICE set of precision-guided bombs, Israel’s Delilah cruise missiles, and Rampage air-to-ground missiles. There are plans for the future integration of Sky Sniper or related stand-off weapons.
These weapons are not U.S.-standard F-35 munitions; they offer the IAF unique capabilities that are tailored to address regional threats.
The F-35I’s use reflects the country’s regional operations doctrine, which prioritizes long-range precision strikes against Israel’s adversaries in the region – in Syria, Iran, and Yemen, as well as potentially non-state actors such as Hamas and Hezbollah.
The F-35I’s stealth characteristics are particularly useful for the IAF’s frequent semi-cover or cover operations in contested or heavily contested airspace against targets on the ground and potentially in the air.
Sustainment and Maintenance
A key part of the F-35I’s autonomy and success relates to the IAF’s maintenance and logistics infrastructure, which gives Israel strategic independence from depot-level repairs and software patches that rely on American decision-making.
This enables the Israeli Air Force to achieve faster repair turnaround times, as well as full sovereignty over the sustainment of its stealth fighters. Another concession to Israel was the F-35I’s wings, which are produced locally in Israel.
In 2 Words: Combat Legend
Israel has put its F-35Is into real-world combat, with dramatic results. Strikes in June against targets in Iran garnered a significant amount of media attention. And while not all strikes were visually documented, it is clear that their effects were devastating to Tehran’s forces, with particularly potent results against Iran’s Russian-supplied S-300 air-defense systems – though missile-production sites as well as UAV production centers were also targeted.
The S-300 is Iran’s most powerful air-defense system, deployed on a permanent basis to protect some of Iran’s most sensitive political and military sites, such as at Isfahan, Bandar-e Bushehr, and Tehran, according to an assessment by the Defense Intelligence Agency.
The Israeli strikes against those assets cleared the way for additional strikes by Israel and the United States against Iranian nuclear infrastructure last month by establishing Israeli air superiority and allowing both countries to fly over the country with impunity.
What Next for F-35I?
Several stealth fighters already are in service with the United States and China. Further, a small number of aircraft in Russian service also have stealth capabilities, although more limited. Overall, there is clear evidence that air forces in the future will increasingly rely on the stealth characteristics of fifth-generation aircraft.
However, as development progresses on even more advanced sixth-generation aircraft — such as the U.S. Air Force’s B-21 Raider bomber, the future F-47 fighter, and the U.S. Navy’s upcoming F/A-XX fighter — fighters such as the F-35 may increasingly play simpler supporting roles.
Thankfully for the Israeli Air Force, no other country in its immediate neighborhood possesses a stealth fighter, and adversary air defenses have proven to present little threat.
This means the F-35I will presumably retain a significant qualitative edge for many years yet to come.
About the Author: Caleb Larson
Caleb Larson is an American multiformat journalist based in Berlin, Germany. His work covers the intersection of conflict and society, focusing on American foreign policy and European security. He has reported from Germany, Russia, and the United States. Most recently, he covered the war in Ukraine, reporting extensively on the war’s shifting battle lines from Donbas and writing on the war’s civilian and humanitarian toll. Previously, he worked as a Defense Reporter for POLITICO Europe. You can follow his latest work on X.
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