A permittee must conduct any key flight-safety event so that the reusable suborbital rocket's instantaneous impact point, including its expected dispersion, is over an unpopulated or sparsely populated area. At a minimum, a key flight-safety event includes:
Ignition of any primary rocket engine,
Any staging event, or
Any envelope expansion.
A permittee must conduct each reusable suborbital rocket flight so that the reentry impact point does not loiter over a populated area.