"Private Carriage for Hire is any business-related flying for hire that does not involve advertising or holding out to the public. It is done under special exceptions to the general operating rules of Part 91. No special certificate is required, although special ratings may be required depending on type of aircraft. Most business pilots have more than a private pilot's certificate.
Business pilots cannot fly an aircraft for compensation or hire unless it is incidental to the business of the company they fly for. Generally, business pilots involved in flying small airplanes are subject to the restrictions of FAR 61.113. In addition, certain pilots are allowed to fly relatively small aircraft, for compensation or hire, if they do so in one of the specialized operations permitted by FAR 119.1(e). These specialized operations do not require compliance with Part 135, but they usually involve some form of compensation or hire. They include: student instruction, certain airport-proximate sightseeing flights, ferry or training flights, crop dusting, bird chasing, banner towing, aerial photography, fire fighting, helicopter-construction operations, pipeline patrol, sightseeing in hot-air balloons, local-airport parachute-jump flights, and certain airport-proximate helicopter operations."