What is the difference between Part 121 135 and 91?

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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At its core, FAA Part 135 is a certificate required by the Federal Aviation Administration for a company to operate as a non-scheduled air charter carrier. It's designed to set boundaries and establish safety procedures for jet charters and other types of commercial aviation operations that fly on demand.

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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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-The term part 135 certificate holder means a person holding an operating certificate issued under part 119 of title 14, Code of Federal Regulations, that is authorized to conduct civil helicopter air ambulance operations under part 135.

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Operators of business aircraft that wish to conduct operations for compensation or hire are generally certificated under Part 135 of the FARs. As a certificate holding entity, the operator must comply with a number of FAA requirements regarding areas such as flight operations, maintenance and training.

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Given these requirements, every airplane operated under part 121 must have at least an additional 45 minutes of fuel at normal cruising fuel consumption. Poor weather conditions may require an operator to carry additional fuel.

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NetJets operates under the Part 135 section of FAR.

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