After decades shrouded in mystery, the NT-43A, known as RAT55, is beginning to show signs of a new operational phase.
The highly secretive United States Air Force aircraft was spotted supporting the launch of NASA’s Artemis II mission, suggesting its role may be evolving into new strategic functions, possibly beyond its traditional activities.
Historically used to measure radar signatures of stealth aircraft, the RAT55 is a unique platform in the world. Equipped with advanced radar systems and specialized sensors, the jet can precisely analyze how stealth aircraft are detected, providing crucial data for the development of low-observability technologies. Its in-flight data collection capability significantly enhances the accuracy of these tests.
Despite its importance, the aircraft faces limitations due to its age. Derived from an older Boeing 737 model, the NT-43A has already surpassed five decades of operation, raising questions about its longevity. Even so, there is still no confirmed direct replacement, keeping the RAT55 as a key asset in highly sensitive testing.
Now, with the possibility of taking on new roles — including support for space missions — the future of the RAT55 could become more active and less secretive. If confirmed, the aircraft may transition from being a “legend” within classified programs to playing a more visible role in advanced technological operations, especially in a context of growing development of new stealth platforms and military drones.
Source: The War Zone | Photo: X @JasonZicker | This content was created with the help of AI and reviewed by the editorial team
— Jason (@JasonZicker) May 22, 2025
