14 CFR §437.71

1. (a)Before initiating flight, a permittee must confirm that all systems and operations necessary to ensure that safety measures derived from §§ 437.55, 437.57, 437.59, 437.61, 437.63, 437.65, 437.67, and 437.69 are within acceptable limits.
2. (b)During all phases of flight, a permittee must—
   1. (1)Follow flight rules that ensure compliance with §§ 437.55, 437.57, 437.59, and 437.61; and
   2. (2)Abort the flight if it would endanger the public.
3. (c)A permittee may not operate a reusable suborbital vehicle in a careless or reckless manner that would endanger any member of the public during any phase of flight.
4. (d)A permittee may not operate a reusable suborbital vehicle in areas designated in a Notice to Airmen under 14 CFR 91.137, 91.138, 91.141, or 91.145, unless authorized by:
   1. (1)Air Traffic Control; or
   2. (2)A Flight Standards Certificate of Waiver or Authorization.
5. (e)For any phase of flight where a permittee operates a reusable suborbital vehicle like an aircraft in the National Airspace System, a permittee must comply with the provisions of 14 CFR part 91 specified in an experimental permit issued under this part.