Differences Between FAA Part 91, 121, and 135 in Aviation
Pilot Institute
FEBRUARY 26, 2025
Think of private jets, charter flights, small turbo-propeller aircraft, and commercial helicopters these are usually part 135 operation aircraft. One of the most notable distinctions between parts 121 and 135 is the requirement for two pilots on a part 121 operation vs. the allowance for one pilot on a part 135 operation.
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