F-35A Lightning II

The U.S. Air Force's fifth-generation multirole stealth fighter — combining low observability, sensor fusion, and internal weapons carriage in a single-engine CTOL design, operated by the U.S. and 18 partner nations.

Overview

The F-35A Lightning II is the conventional takeoff and landing (CTOL) variant of the Lockheed Martin F-35 family, the Pentagon’s largest weapons program. It is the principal 5th-generation fighter of the U.S. Air Force and the most numerous stealth combat aircraft in the world, with over 1,300 delivered to date across the broader F-35 program Army Recognition. The aircraft blends low-observable shaping, internal payload bays, and an advanced sensor-fusion architecture to operate as a networked sensor node in contested airspace. Mature production, despite recurring sustainment and upgrade challenges, continues to drive unit costs downward; a recent blocking buy for Lots 18–19 contracted 296 aircraft at about $24.3 billion Air & Space Forces Magazine.

Development

The F-35 traces its roots to the Joint Strike Fighter program, launched in the 1990s to replace several Cold War-era tactical fleets with a common family of multi-service fighters. Lockheed Martin’s X-35 demonstrator defeated the Boeing X-32 in 2001, and the F-35A prototype first flew in December 2006. Flight-test and development encountered substantial cost growth, software integration delays, and weight-growth issues, delaying initial operational capability (IOC) to August 2016 for the U.S. Air Force. By 2025, the program had delivered a record 191 aircraft in a single year Army Recognition. The F-35B short take-off and vertical landing (STOVL) and F-35C carrier variant (CV) followed, both sharing a common core with the A model.

What comes next

The F-35A Lightning II is still entering service, so its near-term successor is a software and weapons upgrade rather than another airframe. Block 4 is intended to expand processing, sensors and weapon integration, while operators are also buying more stand-off weapons and uncrewed aircraft that can extend a crewed fighter's reach. The lower-cost complement remains the F-16 Fighting Falcon for missions that do not require the F-35's low observability and sensor fusion.

Lockheed Martin is the prime contractor, with Pratt & Whitney supplying the current engine and a wide international supplier base supporting the fleet. Future competition comes from sixth-generation programs and collaborative combat aircraft. Anduril is developing autonomous aircraft for the U.S. Air Force's collaborative program, while Palantir and Helsing work on software that connects sensors, planning and autonomous systems. Those products do not replace an F-35 one for one. They shift part of the sensing, electronic-attack and weapons load to cheaper aircraft that commanders can risk in larger numbers.

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