Each required flight crewmember is required to keep his or her shoulder harness fastened

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What person is directly responsible for the final authority as to the operation of the airplane?

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When is the pilot in command required to hold a category and class rating appropriate to the aircraft being flown?

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A coded transponder equipped with altitude reporting equipment is required for

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1) Class A, Class B, and Class C airspace areas.
2) all airspace of the 48 contiguous U.S. and District of Columbia at and above 10,000 feet MSL (excluding airspace at and below 2,500 feet above the surface).