How Israel Has Modified and Enhanced Its F-35 Fighter Jets

Summary

Israel has made significant modifications to its American-supplied F-35 aircraft, resulting in a uniquely customized variant designated the F-35I, which incorporates numerous Israeli-developed improvements that U.S. forces have historically adopted after observing their effectiveness. One of the most notable enhancements is a flexible software architecture that allows rapid updates to the aircraft's Threat Library, keeping it current with the latest Russian and Iranian air defense system capabilities through access to Israeli intelligence networks. Israel has also engineered custom weapons integration, including Spice guided glide bombs, specially designed drop tanks for long-range deep strikes into Iran while preserving stealth, and underwing pylons capable of carrying additional munitions such as Python-5 and Derby air-to-air missiles when stealth is not a priority. By the end of 2026, Israel plans to operate fifty F-35Is across three squadrons, with additional aircraft deliveries expected before the end of the decade. The base F-35 platform itself is a highly advanced single-seat, single-engine aircraft with stealth capabilities, modern avionics, and a combat range of up to 1,400 kilometers, available in three variants tailored for conventional, short takeoff, and carrier-based operations.