Archer Aviation shares jump ~20% after autonomous aircraft

Shares of Archer Aviation surged nearly 20% on Monday, July 20, 2026, adding roughly $661 million to its market value following the unveiling of a new autonomous military aircraft developed in partnership with defense technology company Anduril. The announcement was made at the Farnborough International Airshow in the United Kingdom, highlighting a significant strategic expansion beyond the company's core urban air taxi business.

The jointly developed aircraft, named Thunder, is a Group 5 autonomous attack rotorcraft designed to operate alongside crewed military aircraft and helicopters. It features a hybrid-electric propulsion system and dual tiltrotors for vertical takeoff and landing and efficient cruising. Archer CEO Adam Goldstein stated that the project required a "clean sheet" design built from the ground up, rather than an adaptation of the company's existing passenger aircraft models. The companies have conducted multiple test flights with full-scale surrogate aircraft, and Thunder's inaugural flight is scheduled for 2027.

The defense sector represents a substantial new market for Archer as it continues to navigate the protracted certification process for its commercial...