What is the difference between an Air Carrier Certificate and an Operating Certificate under Part 119?

An Air Carrier Certificate is issued to operators that hold themselves out as common carriers—meaning they offer air transportation to the general public. An Operating Certificate is issued to operators that conduct specific types of commercial operations without qualifying as common carriers, such as certain on-demand charter services. Part 119 determines which certificate applies based on the nature of the operation, aircraft size, and whether flights are scheduled or on-demand.

What operations are exempt from Part 119 Air Carrier Certificate requirements even though they involve compensation?

Part 119 explicitly exempts several compensated operations, including flight instruction, nonstop sightseeing flights that originate and terminate at the same airport within a 25 statute-mile radius (under 119.1(e)(2), without a universal 30-passenger cap built into that specific exemption), aerial work such as crop dusting and banner towing, skydiving operations, ferry flights, and certain emergency medical flights. These exemptions exist because the compensation in each case is tied to a service other than the transportation of passengers or cargo between points as a common carrier.

How does Part 119 determine whether an operation must follow Part 121 or Part 135?

Part 119 uses a combination of factors—aircraft size, whether the operation is scheduled or on-demand, and the nature of the routes—to assign an operation to either Part 121 or Part 135. Scheduled operations using airplanes with more than 9 passenger seats (10 or more) generally fall under Part 121, while on-demand charter operations using aircraft with a passenger-seat configuration of 30 or fewer seats, or a payload capacity of 7,500 pounds or less, fall under Part 135. Commuter operations are distinguished by conducting at least five round trips per week on at least one route with published schedules using aircraft of 9 or fewer passenger seats.

FAR Part 119 Air Carrier Certificate Requirements

When a pilot earns a commercial certificate, the certificate itself only establishes personal eligibility to act as pilot-in-command for compensation or hire. The deeper regulatory question—what kind of organization must exist around that pilot, and what rules govern that operation—is answered by Title 14 CFR Part 119. Part 119 is the regulatory gatekeeper that classifies air carrier and commercial operations, assigns them to the correct operating rules (Part 121 or Part 135), defines the management structure an operator must maintain, and carves out specific exemptions for paid flying that falls outside the air carrier framework entirely. For the Commercial Pilot knowledge test and for real-world compliance, Part 119 is one of the most consequential sections of the FARs a commercial pilot will encounter.

What Part 119 Actually Does

Part 119 does not itself contain the day-to-day operational rules for flight crews. Instead, it performs three distinct regulatory functions: it tells an operator whether a certificate is required, which type of certificate is required, and which operating rules (Part 121 or Part 135) must be followed. Think of Part 119 as the sorting mechanism—once it classifies your operation, you are sent to the appropriate rule set for the actual flight, crew, aircraft, and maintenance requirements.

The Two Certificate Types

Part 119 establishes two categories of certificates for commercial air transportation. An Air Carrier Certificate is required for operators conducting air transportation as a common carrier. An Operating Certificate is required for operators that do not qualify as common carriers but still conduct commercial operations in regulated categories. The practical distinction matters: a common carrier holds itself out to the general public as available for hire without special negotiation, while a private carrier operates under specific contracts with individual customers.

Part 121 vs. Part 135: How Part 119 Assigns the Rules

The most tested aspect of Part 119 is understanding which operation falls under Part 121 and which falls under Part 135. The dividing lines are drawn by aircraft size, whether the operation is scheduled or on-demand, and the nature of the routes flown.

Part 121 Operations

Part 121 governs scheduled air carrier operations and is the rule set applied to major and regional airlines. Under Part 119, an operation must comply with Part 121 if it conducts scheduled operations using airplanes with more than 9 passenger seats (10 or more, excluding any crewmember seat) in interstate, overseas, or foreign air transportation, or if it uses large airplanes (over 12,500 pounds maximum certificated takeoff weight) in any common-carriage air transportation. The result is that virtually every operation that looks like a traditional airline—published schedules, publicly available seats, large transport-category aircraft—is a Part 121 operation.

Part 135 Operations

Part 135 covers two distinct sub-categories: on-demand operations and commuter operations. On-demand operations are charter-style flights conducted without a published schedule, using aircraft with a passenger-seat configuration of 30 or fewer seats, or a payload capacity of 7,500 pounds or less. Commuter operations are defined in Part 119 with precision: an operator qualifies as a commuter air carrier when it conducts at least five round trips per week on at least one route between two or more points, with published schedules that specify the times and days of operation, using aircraft with 9 or fewer passenger seats and a payload capacity of 7,500 pounds or less. Commuter operations carry enhanced requirements within Part 135 that more closely resemble Part 121 standards, reflecting the scheduled nature of the service and the public reliance it creates.

Operations That Do NOT Require a Part 119 Certificate

One of the most heavily tested areas of Part 119 is the list of compensated operations that are explicitly exempt from the certificate requirement. Pilots and operators frequently assume that any flight conducted for compensation automatically triggers the air carrier framework—Part 119 makes clear that this is not true. The following categories are excluded from Part 119 certificate requirements:

Student instruction — flight training conducted for compensation does not require an air carrier certificate, regardless of the aircraft used.
Nonstop sightseeing flights — the so-called aerial tour exemption under 14 CFR 119.1(e)(2) applies when the flight is nonstop, begins and ends at the same airport, and remains within a 25 statute-mile radius of that airport. Operators should note that this specific exemption does not itself impose a universal 30-passenger cap; passenger-seat limits (such as the 30-seat threshold) are relevant to other rules, including the on-demand definition and 14 CFR 91.147 air tour operations, and must be checked against the current regulatory text.
Ferry and positioning flights — flying an aircraft from one location to another for maintenance or repositioning purposes.
Aerial work operations — this broad category includes agricultural operations (crop dusting, seeding), banner and sign towing, aerial photography and survey, powerline and pipeline patrol, and similar specialized work. The distinguishing characteristic is that the compensation derives from the work being performed, not from transporting passengers or cargo between points.
Skydiving operations — carrying skydivers to an exit altitude is explicitly exempt.
Firefighting operations — certain air attack and tanker operations conducted for governmental entities are excluded.
Certain emergency medical flights — specifically, flights where a medical professional is in command of the medical mission and the operator is not in the business of providing air transportation.

Understanding these exemptions has direct safety and legal consequences. Operating a non-exempt for-hire service without the appropriate Part 119 certificate constitutes a serious FAA violation and can expose both the individual pilot and the operator to certificate suspension or revocation, civil penalties, and criminal liability.

Management Structure Required Under Part 119

Part 119 does not merely sort operations—it mandates an internal management hierarchy for certificated operators. An operator must designate individuals to fill specific management positions, each with defined experience and qualification requirements spelled out in the regulation itself. The key positions include:

Director of Operations (DO) — responsible for the overall operational control of flight operations. Must hold an airline transport pilot certificate if the operation involves airplanes requiring an ATP, and must have specific total flight time and experience in the category of aircraft used.
Chief Pilot — directly responsible for the administration and supervision of pilots. Must hold at least a commercial certificate with appropriate ratings, and must meet minimum flight time requirements specified in Part 119.
Director of Maintenance (DOM) — responsible for the airworthiness of the operator's aircraft fleet. Must hold an Airframe and Powerplant (A&P) certificate and meet experience requirements.

For smaller operators, Part 119 permits one individual to hold more than one management position, provided that person meets the qualifications for each role simultaneously. These accountability structures exist because the FAA recognizes that safety in commercial air transportation depends not just on individual pilot skill, but on a systemic organizational framework that enforces standards at every level.

Key Numbers and Rules to Memorize

25 statute miles — the outer radius limit of the nonstop sightseeing exemption under 119.1(e)(2); the exemption also requires the flight to be nonstop and begin/end at the same airport. Note that this specific exemption does not itself impose a universal 30-passenger cap—passenger-seat limits are relevant to other related rules.
9 passenger seats / 7,500 lb payload — the aircraft size ceiling for Part 135 commuter operations.
5 round trips per week — the minimum scheduling frequency that triggers the commuter definition under Part 135.
10 passenger seats — the threshold above which scheduled operations must comply with Part 121 rather than Part 135.
12,500 lb MCTOW — large airplane threshold; scheduled or common-carriage operations using large airplanes generally require Part 121 compliance.

Common Test Traps

Part 119 is not the operational rule set. Part 119 tells you what certificate you need and who fills the management positions. The actual crew rest, fuel, alternates, and equipment rules are in Part 121 or Part 135. Many students confuse the gatekeeper with the rules themselves.
The sightseeing exemption under 119.1(e)(2) requires the nonstop, same-airport, and 25-statute-mile conditions to all be present simultaneously. Students should not assume a universal 30-passenger cap is part of this specific exemption; passenger-seat limits belong to other related rules and must be verified against current regulatory text.
Commuter ≠ scheduled airline. A commuter operation has published schedules but uses small aircraft (9 or fewer seats) and falls under Part 135, not Part 121, unless aircraft size forces it into 121 territory.
Aerial work is compensated but exempt. Banner towing, crop dusting, and aerial photography all involve payment, yet none require an air carrier certificate. The exemption exists because the compensation is for the work performed, not for the transportation service itself.
Flight instruction is always exempt. No matter the aircraft category, class, or dollar amount charged, providing flight instruction for compensation does not trigger Part 119 requirements.