The supply chain for advanced military electronics stretches from San Diego back to Norway.

Northrop Grumman Corp. said on Sept. 22 that it signed a 21-year agreement with Kitron AS of Norway to provide subassembly electronic modules for F-35 Lightning II aircraft avionics.

Northrop Grumman (NYSE: NOC) designs and builds the communication, navigation and identification, or CNI, avionics in San Diego’s northern inland suburbs.

The deal runs through June 2036 and includes rights for future extensions. Financial terms of the deal were not disclosed.

The aircraft’s prime contractor, Lockheed Martin (NYSE: LMT), rolled out Norway’s first F-35 on Sept. 22 in Fort Worth, Texas.

The fifth-generation fighter aircraft with the high-tech pilot’s helmet system has gained the reputation as the most costly defense contract ever. The F-35 is also known as the Joint Strike Fighter.

Northrop Grumman says its integrated CNI suite provides F-35 pilots with the capability of more than 27 avionics functions including voice and data communication. The CNI design uses advanced software-defined radio technology that allows the simultaneous operation of multiple critical functions while greatly reducing size, weight and power demands on the aircraft.