Douglas built 421 Skyrays, including two prototypes, and they continued to roll out of the El Segundo, Calif., plant until December 1958. After 1962, it was designated the F-6A and served Marine and Navy carrier squadrons until February 1964. An improved version, the "Super-Skyray," was named the F5D Skylancer, but never went into production. The four prototype Skylancers were delivered to NASA, where they contributed to the development of a variety of products, including the Gemini escape system and the space shuttle.