What is the difference between Part 91 and 121 flying?

What is the primary distinction between these different parts of the regulations? Part 91 applies to general aviation and non-commercial operations(civil aircraft). Part 135 applies to commercial on-demand operations(such as private jets). Part 121 applies to large-scale scheduled commercial air carriers.



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Part 91 governs general operating and flight rules for all civil, generally non-commercial aircraft, whereas Part 135's goal is to “hold [commercial] pilots, aircraft, operations and even passengers to a higher standard than would pertain to someone providing his own transportation.” Part 91's rules are always in ...

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§ 121.481 Flight time limitations: One or two pilot crews. (a) A certificate holder conducting flag operations may schedule a pilot to fly in an airplane that has a crew of one or two pilots for eight hours or less during any 24 consecutive hours without a rest period during these eight hours.

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14 CFR Part 121 permits landing or takeoff by domestic scheduled air carriers where a local surface restriction to visibility is not less than 1/2 statute mile, provided all turns after takeoff or before landing and all flights beyond 1 statute mile from the airport boundary can be accomplished above or outside the ...

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Whether you're flying a Cessna 182 or a Boeing 777, you have to comply with these rules. However, Part 91 rules are non-commercial; they generally don't contemplate that any compensation, or even reimbursement, will be paid for carriage of passengers or cargo.

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Under Part 117, the part of the federal law that covers flight duty limitations and rest requirements for airline pilots, pilots are limited to 100 hours per month and 1,000 hours per year, in addition to daily restrictions.

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Flight times within the duty periods are restricted to a maximum of 8 hours for flight crews consisting of one pilot and 10 hours for flight crews consisting of two pilots.

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Daily. An airline transport pilot can fly up to 8 hours per 24 hour period and up to 10 hours if a second pilot is aboard. Pilots are required to rest a minimum of 16 hours postflight.

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It lists eleven exempted operations allowing a commercial pilot to operate under Part 91. Those include flight instruction, skydiving flights, banner towing, and air tours which begin and end at the same airport and remain within a 25-statute-mile radius.

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