The newest upgrade involves extended range fuel tanks, developed by Israel Aerospace Industries, that can increase operational reach by hundreds of kilometers.
By Hezy Laing
Israel’s Air Force has accelerated upgrades to its F‑35I “Adir” fleet, integrating new range‑extending conformal fuel tanks and expanded weapons configurations that no other F‑35 operator currently fields.
These enhancements come as Israeli defense planners continue preparing for long‑range contingencies involving Iran’s nuclear and missile infrastructure.
The F‑35I is the only variant of the aircraft that the United States permits to be indigenously modified, giving Israel a unique level of access to the jet’s architecture.
Since the aircraft’s arrival in 2016, Israel has integrated its own electronic‑warfare suite, command‑and‑control systems, and weapons interfaces, creating a platform tailored to the region’s operational demands.
This customization is made possible by a special agreement with Lockheed Martin that grants Israel access to the F‑35’s open‑architecture software, allowing domestic technologies to be plugged directly into the aircraft’s systems.
Among these additions are the Elbit Systems EW suite, Rafael’s SPICE precision‑guided munitions, and advanced datalinks that connect the jet to Israel’s broader air‑defense and intelligence network.
The newest upgrade involves conformal fuel tanks (CFTs) developed by Israel Aerospace Industries, designed to extend the aircraft’s range without compromising its low‑observable profile.
Defense sources have indicated that these tanks could increase operational reach by hundreds of kilometers, reducing dependence on aerial refueling during long‑distance missions.
Yechiel Leiter, Israel’s ambassador to the U.S., told Israel Hayom “We developed fuel tanks that extend the aircraft’s range without compromising stealth.”
“The number of flight hours our pilots have on the F-35 is greater than that of all the pilots of the other foreign countries that were partners in developing the aircraft,” Leiter said.
“The feedback from our pilots reaches Lockheed Martin. When I visited there a few weeks ago, their CEO told me that Israel’s information and developments ‘are worth many billions to my company.'”
In parallel, Israel has been testing expanded internal and external weapons configurations, integrating systems such as the SPICE 1000, SPICE 250, and the Rampage air‑launched standoff missile, significantly broadening the Adir’s strike envelope.
The IAF has also emphasized the jet’s ability to fuse intelligence from multiple sensors, enabling it to function as an airborne command node during complex operations.
Former IAF commander Maj. Gen. (res.) Amikam Norkin has repeatedly stressed that long‑range precision capability is “central to Israel’s security doctrine,” underscoring the strategic rationale behind these upgrades.
Iran’s nuclear and missile facilities are dispersed, hardened, and located more than 1,000 kilometers from Israel, making range, stealth, and precision essential components of any future contingency planning.
With its expanding range, enhanced payload, and uniquely Israeli systems, the F‑35I Adir is evolving into a platform designed for the region’s most demanding missions and a key pillar of Israel’s long‑term deterrence posture.
