The Boeing Phantom Ray is an American demonstration stealth unmanned combat air vehicle (UCAV) developed by Boeing using company funds. The autonomous Phantom Ray is a flying wing around the size of a conventional fighter jet, and first flew in April 2011. It will conduct a program of test flights involving surveillance, ground attack and autonomous aerial refueling missions. The developers say it can carry 4,500 pounds of payload.

The Unmanned Carrier-Launched Airborne Surveillance and Strike (UCLASS) was a United States Navy program to develop an autonomous carrier-based unmanned combat aerial vehicle providing an unmanned intelligence and strike asset to the fleet. After debate over whether the UCLASS should primarily focus on stealthy bombing or scouting, the Pentagon instead changed the program entirely into the Carrier-Based Aerial-Refueling System (CBARS) to create a UAV for aerial refueling duties to extend the range of manned fighters, which led to the Boeing MQ-25 Stingray.