14 CFR § 437.5
Eligibility for an experimental permit
July 13, 2020
The FAA will issue an experimental permit to a person to launch or reenter a reusable suborbital rocket only for—
(a) Research and development to test new design concepts, new equipment, or new operating techniques;
(b) A showing of compliance with requirements for obtaining a license under this subchapter; or
(c) Crew training before obtaining a license for a launch or reentry using the design of the rocket for which the permit would be issued.