The Israeli Air Force's F-35I Adir represents the most advanced combat aircraft in the Middle East and the centerpiece of Israel's long-range strike capability against Iran. When Israeli aircraft struck Iranian nuclear facilities and military installations in 2025, the Adir's stealth characteristics and precision strike capabilities enabled penetration of one of the most heavily defended airspaces in the region. The missions — covering round-trip distances exceeding 3,200 kilometers through hostile territory — rank among the most ambitious air operations in military history.
The Adir: Not Just Another F-35
Israel's relationship with the F-35 program is unique among all international partners. The United States granted Israel permission to install indigenous systems into the aircraft — a privilege extended to no other nation. The F-35I Adir incorporates:
- Israeli electronic warfare suite — Developed by Elisra (a subsidiary of Elbit Systems), replacing or supplementing the standard AN/ASQ-239 system with capabilities tailored to Middle Eastern threat environments.
- Modified mission computers — Israeli software enables integration with IAF-specific command and control networks and allows rapid reprogramming for emerging threats.
- Indigenous weapons integration — The Adir can employ Israeli-made munitions including the Rafael Spice family of GPS/electro-optical guided bombs and potentially the Python-5 air-to-air missile, alongside standard US weapons like JDAM and SDB.
- Enhanced SIGINT capabilities — The aircraft is believed to carry additional sensors for signals intelligence collection, leveraging Israel's expertise in electronic intelligence.
Israel ordered 75 F-35I aircraft in multiple tranches, with over 50 delivered by 2025. Two operational squadrons — the 140th "Golden Eagle" Squadron and the 116th "Lions of the South" Squadron — operate from Nevatim Air Base in the Negev desert.
The Range Challenge
The fundamental challenge of IAF strikes against Iran is distance. From Nevatim Air Base to Natanz is approximately 1,600 kilometers — well beyond the F-35A's internal-fuel combat radius of roughly 1,100 km. Reaching targets in Iran requires one or more of the following:
- Aerial refueling — The IAF operates Boeing 707-based tankers (Re'em) and has acquired KC-46 Pegasus tankers. Refueling over friendly or neutral airspace (eastern Mediterranean, Saudi Arabia, or Persian Gulf) extends range sufficiently for Iranian strikes.
- External fuel tanks — The F-35 can carry external drop tanks, but these compromise its stealth profile by increasing radar cross-section. Tanks would be jettisoned before entering Iranian airspace.
- Route optimization — Flight paths through Saudi or Jordanian airspace significantly shorten the distance compared to routing around hostile territory. Coalition cooperation in the 2025 conflict likely included overflight permissions.
The tanker fleet represents a critical vulnerability. Large, non-stealthy tanker aircraft must orbit in predictable patterns while fighters cycle through refueling. Protecting the tanker track requires fighter escorts and suppression of any threat that could reach the refueling zone.
Penetrating Iranian Air Defenses
Iran operates a layered air defense network centered on Russian-supplied systems and domestic derivatives:
- S-300PMU-2 — Long-range SAM system delivered by Russia in 2016, deployed around Tehran and key nuclear sites. Capable of engaging targets at ranges up to 200 km.
- Bavar-373 — Iran's domestically produced long-range SAM, claimed to be equivalent to the S-300. Operational since 2019.
- Third Khordad / Raad — Medium-range systems covering gaps between long-range batteries.
- Integrated radar network — Multiple early warning and acquisition radars providing overlapping coverage.
The F-35I's stealth characteristics are its primary tool for defeating this network. The aircraft's radar cross-section is classified but is estimated to be comparable to a metal marble — effectively invisible to most radar systems at operationally relevant ranges. This allows the Adir to penetrate defended airspace without triggering engagement by area defense SAMs.
However, stealth is not invisibility. Very low-frequency radars, bistatic radar networks, and infrared search-and-track systems can potentially detect stealth aircraft at reduced ranges. The IAF mission planning process identifies and routes around the most dangerous threat systems, while electronic warfare capabilities actively jam or deceive radars that might achieve detection.
Strike Packages and Mission Planning
Deep strike missions against Iran involve far more than a flight of F-35s. A typical strike package would include:
- F-35I strike aircraft — Carrying precision-guided munitions in internal weapons bays to maintain stealth. Likely armed with GBU-31 JDAM (2,000 lb), GBU-39 SDB (250 lb), or Israeli Spice-250 for different target types.
- F-15I Ra'am support aircraft — Carrying heavier weapons including GBU-28 bunker busters for hardened underground targets. Operating behind the F-35 SEAD corridor.
- Electronic warfare aircraft — Potentially including G550 CAEW (Conformal Airborne Early Warning) and dedicated electronic attack platforms to blind Iranian radars.
- Tanker support — Multiple refueling tracks at safe distances from Iranian airspace.
- Search and rescue — CSAR assets pre-positioned in case of aircraft losses.
Lessons from the 2025 Strikes
The Israeli strikes against Iranian nuclear facilities demonstrated several important lessons about stealth aircraft in contested environments. The F-35I proved its ability to penetrate defended airspace and deliver precision strikes against hardened targets — validating the enormous investment Israel and the United States have made in the program.
Yet the operations also highlighted the logistical complexity of long-range stealth strikes. The coordination required between strike aircraft, tankers, electronic warfare support, and search-and-rescue assets demanded weeks of planning and the involvement of thousands of personnel. The sortie generation rate for such complex missions is inherently limited — the IAF could sustain deep strikes but not at the tempo possible for shorter-range operations.
The conflict also raised questions about stealth aircraft attrition. While no confirmed F-35I losses occurred during Iranian strikes, the potential loss of even one aircraft — carrying classified stealth technology — would have enormous intelligence implications. The recovery or compromise of F-35 stealth materials to Russian or Chinese analysis would damage not just Israel but the entire Western alliance's technological edge. This risk influences every mission planning decision and may limit how aggressively stealth assets are employed against the most heavily defended targets.
Beyond Iran: The Adir's Strategic Role
The F-35I's role extends beyond strike missions. The aircraft's sensor suite — including the AN/APG-81 AESA radar, the DAS infrared sensor system, and the EOTS targeting pod — makes it an extraordinarily capable intelligence collection platform. IAF F-35s routinely conduct surveillance missions that gather electronic intelligence, map air defense networks, and monitor military activity across the region without being detected.
This dual role — simultaneously a strike platform and a sensor node — makes the Adir the IAF's most valuable strategic asset. As Israel's fleet grows toward 75 aircraft over the coming years, the F-35I will increasingly define the boundaries of what the IAF can achieve against distant, well-defended adversaries.