Under which condition can a private pilot share expenses for a flight?

A private pilot can share expenses for a flight under the condition that the total cost is divided equally among all passengers. This option aligns with the regulations set by the FAA, which permit the sharing of costs such as fuel, oil, and airport expenses, provided that the pilot does not receive any payment for acting as the pilot or for the flight itself beyond these shared expenses.

Equally dividing costs ensures that the pilot is not profiting from the flight, which is a key requirement to remain compliant with regulations governing private pilot operations. This arrangement allows the pilot to share the operational costs fairly while maintaining the integrity of the private pilot privileges, reinforcing the distinction between a private and a commercial flight.

The other conditions, while they might have specific regulations that apply, do not meet the criteria for expense sharing as outlined by the FAA governing private pilots.