Differences Between FAA Part 91, 121, and 135 in Aviation
Pilot Institute
FEBRUARY 26, 2025
Under parts 121 and 135, however, this is not the case, and pilots must adhere to strict rest schedules to ensure that they are not fatigued during their operations. Another example is weather minimums. A part 121 or 135 crew cannot legally initiate an approach if the weather is below minimums.
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