Which operational control applies to all contracted pilots carrying passengers?

Part 135 operational control is designed specifically for on-demand and charter operations, which includes the carrying of passengers. This regulatory framework establishes standards for safety, operational procedures, and pilot qualifications, ensuring a high level of safety for passengers.

Additionally, Part 91 governs general aviation operations, which can include privately-operated flights and certain commercial operations that do not carry passengers for compensation. The inclusion of Part 91 in the answer indicates that even flights not subject to the strict rules of Part 135 must still adhere to general aviation safety practices. Therefore, any operation involving contracted pilots carrying passengers must comply with the relevant regulations of both Part 135 for commercial operations and Part 91 for general aviation, providing a comprehensive safety standard across various types of operations.

The other choices do not fully encapsulate the required operational control for contracted pilots carrying passengers under the provided regulations, as they fail to acknowledge the necessity of both parts for complete operational compliance and safety standards.