I'm not sure if I didn't read this clearly or not, if I did, sorry, but for a Restricted certified a/c, AFAIK, it's no passengers while performing Restricted operations. Passengers are fine for non-Restricted flights.
bombadier29 wrote:
The majority of warbirds, helicopter and otherwise, are in the experimental category. Many operators have exemptions to carry passengers. Others skirt the system by giving ride in return for a donation. Stuff in the limited category are in it for certain, specific reasons. Firefighting, Logging and such have very specific limitations on their certificates because they do operate for "compensation or hire". One of those limitations is no passengers or other people in the machine unless they are required for the operation or undergoing training.