She Never Flew: Concepts from the X-44 Manta may have influenced the U.S. Air Force's Next Generation Air Dominance (NGAD) program, which is developing a sixth-generation fighter to replace the F-22.

The United States formally left the Manta military base in Ecuador on Friday at 9.00 a.m. local time, at a ceremony in which Ecuadorian authorities took full control of the Pacific Coast facilities.

X-44 MANTA: The Stealth Fighter That Could Have ... It is likely that the X-44 heavily inspired the concept for the Air Force’s Next Generation Air Dominance (NGAD) sixth-generation warplane.