Which type of aircraft are prohibited under Part 121?
§ 121.159 Single-engine airplanes prohibited. No certificate holder may operate a single-engine airplane under this part.
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Part 121 is scheduled air carrier (airliners). Part 133 is external load (helicopter) operations. Part 135 is a set of rules with more stringent standards for commuter and on-demand operations. Part 135 operator rules govern commercial aircraft.
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 ...
§ 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.
They can take off in “zero-zero” conditions. Commercial Part 121/135 operators have the following standard takeoff minimums: One and two engines: one-mile visibility (1 mile)Three or more engines: one-half mile visibility (1/2 mile)
While most US carriers operate under 14 CFR Part 121 (a classification for regularly-scheduled air carriers), JSX (formerly known as Jet Suite X), operates under 14 CFR Part 135 (a classification primarily for commuter and on-demand operations).
A single-pilot operator is a certificate holder that is limited to using only one pilot for all part 135 operations. That specific pilot is listed by name and certificate number on the FAA issued Operations Specification (OpSpec) A040.