FAR Part 125 — Large Airplane Operations

14 CFR Part 125 occupies a regulatory gap that confuses many operators: large airplanes operated for compensation that are neither scheduled air carrier flights under Part 121 nor the smaller commuter and on-demand aircraft typical of Part 135. The rule applies to U.S.-registered airplanes — the applicability is registration-based, not operator-nationality-based — that carry 20 or more passenger seats or have a maximum payload capacity of 6,000 lb or more, when operated by persons other than U.S. or foreign air carriers for the carriage of persons or property for compensation or hire. §125.1 states the applicability; §125.3 establishes the certificate requirement: no person may operate a covered airplane without, or in violation of, an operating certificate and appropriate operations specifications issued under Part 125.

The distinguishing characteristic of Part 125 is the absence of common carriage. An air carrier by definition holds out transportation services to the public — any member of the public may book a seat. A Part 125 operator, by contrast, operates under contract for a specific customer or set of customers without holding out to the general public. The classic Part 125 scenarios are: a corporation operating a converted Boeing 737 BBJ or Airbus ACJ319 for its own executives (non-common carriage, large airplane, compensation involved through the corporate structure); a professional sports franchise operating its own large charter jet; or a specialized cargo operator moving heavy freight for a single client under a dedicated contract. NCAA athletic department charters frequently operate under Part 125 when the institutional operator controls the aircraft rather than contracting with a Part 121 charter carrier.

§§125.5 through 125.13 establish the certification pathway. An applicant for a Part 125 Operating Certificate must submit an application to the local FSDO with a complete operations manual, a training program for crewmembers, and a maintenance program — the three foundational documents that also anchor Part 121 and Part 135 certificates. The operations manual must describe the operator's policies, procedures, and the specific aircraft types to be operated; the training program must address initial and recurrent ground and flight training for pilots, flight attendants (if applicable), and other crewmembers; and the maintenance program must establish the inspection and overhaul intervals for the aircraft types operated. Unlike the more prescriptive Part 121, Part 125 provides operators somewhat more flexibility in structuring these programs, subject to FAA approval via Ops Specs.

§125.269 addresses pilot qualification standards. Pilots operating as PICs under Part 125 must hold an ATP certificate and, for turbine-powered aircraft, the appropriate type rating. §125.271 covers experience requirements for PICs: at minimum 1,200 hours total time, including specific time in category and class. Crewmember training under §125.285 requires initial and annual recurrent training, including emergency procedures training. §125.291 requires proficiency checks for PICs at least every 12 calendar months, and §125.293 requires instrument competency checks at the same interval — both of which must be conducted by an FAA inspector or an approved check airman.

§125.247 through §125.265 establish the maintenance program requirements in detail. Each Part 125 operator must have an approved aircraft inspection program. Unlike the standard annual inspection framework of Part 91, Part 125 operators typically develop continuous or phased inspection programs that spread required inspections across the operating cycle, preventing an entire inspection from concentrating into a single extended downtime event. The required maintenance program must identify approved maintenance providers, establish the intervals for all scheduled maintenance tasks, and describe how airworthiness directives will be tracked and complied with for each aircraft type in the operation.

Part 125 operations are uncommon in traditional flight school contexts, but they appear at the intersection of flight training and corporate aviation when a school operates large multi-engine turbine training aircraft — some advanced type-rating training facilities that operate Boeing 737 or Airbus A320 aircraft in a non-common-carriage capacity may have Part 125 obligations depending on how compensation flows. More directly, flight school graduates entering corporate aviation management roles will routinely encounter Part 125 certificates when managing flight departments operating large business jets like the Bombardier Global 7500, Dassault Falcon 8X, or Gulfstream G700, all of which exceed 20 seats or the payload threshold when configured for high-density corporate transport.

The interaction between Part 125 and Part 91 Subpart K (Fractional Ownership) is worth noting: §91.1001 through §91.1087 govern fractional ownership programs for large aircraft, and fractional owners who would otherwise fall under Part 125 may qualify for the more flexible Subpart K framework depending on the fraction owned and operational control structure. Operators near the boundary between Part 91 Subpart K and Part 125 frequently seek FSDO legal interpretation before structuring their programs, since the consequences of misclassification include operating without the required certificate.

Aviatize's compliance and auditing module supports Part 125 certificate management by maintaining the operations manual version history, training program approval status, and Ops Specs amendment log in a single accessible record. Post-holder qualification files — PIC ATP certificate and type rating status, experience hour totals under §125.271, and proficiency check currency under §125.291 — are tracked against their respective intervals, with alerts generated before any currency lapses.

For the maintenance program obligations under §§125.247 through 125.265, the maintenance control module maps each aircraft in the Part 125 fleet to the operator's approved inspection program, tracking the due dates for all scheduled tasks and flagging airworthiness directive compliance intervals independently for each aircraft. The smart planning and booking module can be configured to honor maintenance downtime windows within the approved phased inspection schedule, ensuring that revenue or training flights are not inadvertently scheduled during a mandatory inspection period that would render the aircraft non-compliant with the Part 125 maintenance program.