(a) Each person who conducts operations when common carriage is not
involved with airplanes having a passenger-seat configuration of 20 seats
or more, excluding each crewmember seat, or a payload capacity of 6,000
pounds or more, shall, unless deviation authority is issued --
(1) Comply with the certification and operations specifications
requirements of part 125 of this chapter;
(2) Conduct its operations with those airplanes in accordance with the
requirements of part 125 of this chapter; and
(3) Be issued operations specifications in accordance with those
requirements.
(b) Each person who conducts noncommon carriage (except as provided in
§91.501(b) of this chapter) or private carriage operations for
compensation or hire with airplanes having a passenger-seat configuration
of less than 20 seats, excluding each crewmember seat, and a payload
capacity of less than 6,000 pounds shall --
(1) Comply with the certification and operations specifications
requirements in subpart C of this part;
(2) Conduct those operations in accordance with the requirements of
part 135 of this chapter, except for those requirements applicable only to
commuter operations; and
(3) Be issued operations specifications in accordance with those
requirements.