Part 91 vs. Part 135 Aircraft Management: What Aircraft Owners Need to Know

Part 91 generally covers private and corporate aircraft operations, while Part 135 applies to qualifying commercial charter and on-demand operations. For aircraft owners, the choice affects operational control, maintenance, crew requirements, aircraft availability, compliance, and the ability to generate charter revenue.

Owning a private aircraft gives you control over when, where, and how you travel. But once you begin thinking about aircraft management, one of the most important decisions is whether the aircraft will operate solely for private use or also be made available for charter.

That is where the distinction between Part 91 vs. Part 135 aircraft management becomes important.

Both fall under Federal Aviation Administration regulations, but they apply to very different types of operations. Part 91 generally governs private, non-commercial flying, while Part 135 applies to certain commuter and on-demand commercial operations, including many charter flights. The FAA issues Part 135 operating authority to operators that meet specific certification, aircraft, training, maintenance, management, and operational requirements.

For aircraft owners, the choice can affect everything from crew management and maintenance to aircraft availability, operating costs, compliance, and the ability to generate charter revenue.

Here is what owners should understand about Part 91 vs. Part 135 before deciding how their aircraft should be managed.

What Is Part 91 Aircraft Management?

Part 91 aircraft management generally applies when an aircraft is being operated privately rather than as an air carrier providing transportation for compensation or hire.

Typical examples include:

• An individual flying a privately owned aircraft
• A company using its aircraft to transport executives or employees
• An owner using the aircraft primarily for personal or business travel
• A corporate flight department operating company-owned aircraft

Under Part 91 aircraft operations, the owner or company typically retains greater flexibility over how the aircraft is used.

A professional management company may still handle many of the day-to-day responsibilities, including:

• Crew recruitment and scheduling
• Maintenance planning
• Flight scheduling
• Dispatch coordination
• Hangar arrangements
• Insurance coordination
• Regulatory documentation
• Aircraft cleaning and presentation
• Trip planning
• Financial reporting

Part 91 does not mean the aircraft operates without regulation. Owners and operators still must comply with applicable FAA rules on airworthiness, pilots, maintenance, flight operations, and safety.

However, the regulatory framework is generally less complex than that required for commercial charter operations.

What Is Part 135 Aircraft Management?

Part 135 aircraft management applies when an aircraft is operated under an authorized Part 135 air carrier or operating certificate for qualifying commuter or on-demand commercial service.

The FAA describes Part 135 authority as the framework used for on-demand, unscheduled air service and certain commuter operations.

For an aircraft owner, placing an aircraft on a Part 135 certificate may allow the aircraft to be used for charter when the owner is not flying it.

That creates the possibility of generating revenue to help offset some ownership expenses.

However, Part 135 aircraft operations come with substantially more operational and regulatory oversight.

Depending on the operation, the Part 135 certificate holder may be responsible for areas such as:

• Operational control
• FAA-approved or accepted manuals
• Pilot qualifications and training
• Crew duty and rest requirements
• Maintenance programs
• Aircraft conformity
• Drug and alcohol testing programs
• Hazardous materials programs
• Required management personnel
• Recordkeeping
• Operations Specifications
• Dispatch and flight-following procedures

The exact requirements depend on the aircraft and the type and scope of the operator’s authority.

Part 91 vs. Part 135: The Main Difference

The simplest way to understand Part 91 vs. Part 135 is to look at the flight’s purpose.

Part 91 generally applies to private operations where the aircraft is being used by its owner or company rather than providing commercial air transportation to the public.

Part 135 generally applies when a certificated operator provides qualifying on-demand or commuter air transportation for compensation or hire.

This distinction matters because commercial operations introduce additional responsibilities designed around carrying paying passengers or cargo.

The FAA specifically notes that general aviation conducted under ordinary Part 91 is generally not subject to the commercial crewmember flight and duty limits applicable to Part 135 operations.

Understanding Operational Control

Operational control is one of the most important issues in Part 91 vs. 135 operations.

In simple terms, operational control refers to who has the authority and responsibility to initiate, conduct, and terminate a flight.

For a private Part 91 flight, operational control generally rests with the appropriate owner or operator under the applicable arrangement.

For a Part 135 charter flight, the certificated Part 135 operator must exercise operational control.

This distinction cannot simply be changed on paper while another party effectively controls the commercial flight.

The FAA places particular emphasis on legitimate charter structures and warns owners and pilots to understand who is exercising operational control. It also provides guidance for aircraft leasing arrangements because improperly structured operations can result in illegal charter activity.

For aircraft owners considering charter, this is one reason it’s important to work with an experienced management company and a properly certificated operator.

Part 91 Aircraft Operations: What Owners Can Expect

For owners who primarily want the aircraft available for personal or corporate travel, Part 91 aircraft operations can offer a straightforward ownership structure.

The aircraft remains focused on the owner’s schedule and mission.

That can provide several advantages.

More Owner Availability

If the aircraft is not being chartered to third parties, the owner generally does not have to work around charter bookings.

This can matter for executives or individuals who need frequent short-notice access.

Greater Operational Flexibility

Part 91 owners often have more flexibility regarding scheduling, crew arrangements, and day-to-day aircraft use, subject to applicable regulations and safe operating practices.

Simpler Compliance Structure

Although aircraft management still requires considerable oversight, ordinary Part 91 aircraft management does not involve the same certification structure required for commercial Part 135 operations.

Easier Mission Customization

Crew preferences, cabin setup, catering standards, scheduling, maintenance planning, and other details can be built closely around the owner’s needs.

For many owners, preserving this control and availability is more important than generating charter revenue.

Part 135 Aircraft Operations: What Changes?

Owners considering Part 135 aircraft management should understand that adding charter capability changes how they manage the aircraft.

The aircraft must be suitable and authorized for the operator’s approved operations.

The FAA requires Part 135 certificate holders to meet detailed requirements involving aircraft, maintenance, management personnel, manuals, crew training, drug and alcohol programs, and other operating systems.

The Aircraft Must Meet Part 135 Requirements

Before an aircraft can be used for Part 135 service, it must meet applicable requirements and be properly added to the operator’s authorized fleet.

The FAA may require a conformity review to confirm that the aircraft and its records satisfy applicable standards.

This can involve reviewing:

• Aircraft records
• Airworthiness status
• Inspection status
• Life-limited components
• Maintenance documentation
• Required equipment
• Aircraft configuration

Incomplete maintenance records can create significant issues when transitioning an aircraft into Part 135 service.

Pilot Requirements Become More Structured

Part 135 aircraft operations involve additional pilot qualification, training, checking, and recordkeeping requirements.

The operator must ensure crewmembers satisfy applicable FAA standards and its approved or accepted training program.

That can mean additional simulator training, proficiency checks, recurrent training, and operational oversight compared with a typical private operation.

Flight and Duty Rules Apply

Part 135 pilots are subject to applicable flight time, duty period, and rest requirements under Part 135 Subpart F.

Ordinary Part 91 operations generally do not operate under those same commercial crew limits.

This difference can affect scheduling, crew staffing, and aircraft availability.

Part 91 vs. Part 135 Maintenance Requirements

Maintenance is another major consideration in Part 91 vs. Part 135 aircraft management.

Both require airworthy aircraft, proper inspections, and compliant maintenance.

However, Part 135 generally introduces additional maintenance requirements and oversight.

The FAA notes that Part 135 maintenance requirements can be more stringent than Part 91, with the exact program depending in part on aircraft size and configuration. Certain Part 135 aircraft may operate under approved aircraft inspection programs, while larger aircraft can be subject to continuous airworthiness maintenance programs.

For owners, that can affect:

• Maintenance planning
• Inspection intervals
• Component overhaul requirements
• Documentation standards
• Maintenance costs
• Aircraft downtime

A management company should help owners understand these requirements before placing an aircraft on a charter certificate.

Can a Part 91 Aircraft Also Fly Part 135?

Potentially, yes.

An aircraft can be used by its owner for private Part 91 flights while also being made available for Part 135 charter through an authorized operator, provided the arrangement and each flight comply with the applicable requirements.

The regulatory framework is determined on a flight-by-flight basis.

An owner’s private trip may operate under Part 91, while a revenue charter trip in the same aircraft may operate under Part 135.

However, the aircraft must meet the requirements necessary for its Part 135 use, and the Part 135 certificate holder must exercise operational control over charter flights.

This dual-use arrangement is common in managed aircraft programs because it can preserve private use while allowing owners to generate charter revenue when the aircraft would otherwise sit idle.

Can Part 135 Charter Revenue Offset Ownership Costs?

This is one of the biggest reasons owners explore Part 135 aircraft management.

Private aircraft ownership includes significant fixed and variable expenses, such as:

• Hangar costs
• Insurance
• Crew salaries
• Training
• Scheduled maintenance
• Unscheduled maintenance
• Engine programs
• Navigation and software subscriptions
• Administration
• Aircraft cleaning and detailing

Chartering the aircraft during unused periods can generate revenue that helps offset some of those costs.

However, charter revenue should not automatically be viewed as profit.

More charter flying can also increase:

• Flight hours
• Engine cycles
• Maintenance requirements
• Interior wear
• Component usage
• Cleaning requirements
• Crew activity
• Administrative workload

Owners should evaluate the net economics rather than focusing only on gross charter revenue.

Flight Group Corporation’s aircraft management programs can include financial reporting, operating budget coordination, maintenance planning, crew management, scheduling, and charter revenue production when desired.

Part 91 vs. Part 135 Requirements for Aircraft Owners

When comparing Part 91 vs. Part 135 requirements, owners should consider much more than FAA paperwork.

The operating model can affect the entire ownership experience.

Part 91 May Be Better Suited for Owners Who:

• Want the aircraft primarily for personal or company use
• Prioritize maximum owner availability
• Do not need charter revenue
• Want a simpler operational structure
• Fly frequently or on short notice
• Want greater control over aircraft scheduling

Part 135 May Be Worth Considering for Owners Who:

• Want to generate charter revenue
• Have periods when the aircraft is regularly unused
• Are comfortable allowing qualified charter customers to use the aircraft
• Understand the effect of additional utilization
• Are willing to meet the additional maintenance and compliance requirements
• Work with a qualified Part 135 operator

Neither structure is automatically better.

The right option depends on how the owner expects to use the aircraft.

Part 91 vs. 135 Operations: What About Scheduling?

Scheduling can become one of the most noticeable differences for owners.

Under a pure Part 91 program, the aircraft’s calendar is primarily built around the owner’s travel.

Under a Part 135 charter program, unused time may be offered for charter.

A well-managed program should still prioritize owner access according to the management agreement, but owners need to understand:

• How much notice is required to reclaim the aircraft
• Whether charter trips can be declined
• How owner trips take priority
• What happens if a charter trip overlaps with an owner request
• How positioning flights are handled
• How maintenance is scheduled around both owner and charter activity

These details should be clear before the aircraft enters a charter program.

What About Aircraft Wear and Resale Value?

More utilization generally means more flight hours and cycles.

That can affect:

• Maintenance schedules
• Engine usage
• Landing gear cycles
• Interior condition
• Paint condition
• Component replacement
• Future resale considerations

However, utilization alone does not determine aircraft condition.

An aircraft that receives proactive maintenance, professional crew oversight, regular cleaning, and strong recordkeeping may remain in excellent condition even with charter use.

This is why aircraft management quality matters as much as the choice between Part 91 and Part 135.

Does Part 135 Mean the Owner Loses Control of the Aircraft?

Not necessarily.

The owner still owns the aircraft and can define many aspects of the management relationship through the management agreement.

However, when the aircraft is being operated on a Part 135 charter flight, the certificated operator must maintain the required operational control.

That means an owner or passenger cannot simply override certain safety, crew, dispatch, maintenance, and operational decisions.

This separation is an important part of legal Part 135 aircraft operations.

How Do Crew Requirements Differ?

Crew management can look different depending on the operation.

Under Part 91 aircraft operations, owners may have greater flexibility in structuring pilot staffing, subject to aircraft certification, pilot qualification, insurance, and applicable FAA requirements.

Under Part 135, pilots must satisfy the operator’s FAA-compliant qualification and training standards for that operation.

This may include:

• Initial training
• Recurrent training
• Competency or proficiency checks
• Aircraft-specific qualifications
• Recordkeeping
• Drug and alcohol program participation
• Applicable flight and duty limitations

For owners considering Part 135, crew training and staffing should therefore be part of the financial and operational analysis.

How Does Insurance Differ?

Insurance requirements may also change when an aircraft enters commercial service.

Private aircraft insurance may not automatically provide the coverage necessary for Part 135 charter operations.

Commercial operations can affect:

• Required liability limits
• Policy structure
• Approved pilots
• Aircraft use classification
• Charter exposure
• Premium costs

The FAA also requires U.S. direct air carriers conducting applicable interstate or foreign air transportation to file evidence of aircraft accident liability insurance meeting regulatory requirements.

Owners should coordinate insurance planning before placing an aircraft into commercial service.

Questions to Ask Before Choosing Part 91 or Part 135 Management

Before deciding between Part 91 vs. Part 135 aircraft management, owners should ask:

1. How frequently will I personally use the aircraft?
2. How much owner availability do I need?
3. Is charter revenue important to my ownership strategy?
4. How many charter hours would realistically be available?
5. What additional maintenance will Part 135 require?
6. How will charter activity affect aircraft wear?
7. What management and administrative costs will change?
8. Who will exercise operational control?
9. What crew training will be required?
10. How will owner trips be prioritized over charter requests?
11. What percentage of charter revenue will the owner receive?
12. Who pays for positioning, cleaning, maintenance, and other charter-related costs?
13. How will the aircraft’s condition and presentation be maintained?
14. What reporting will I receive?
15. Is the aircraft currently suitable for Part 135 operations?

A professional management company should be able to walk through these questions before recommending a structure.

The Role of an Aircraft Management Company

Whether an aircraft operates under Part 91, Part 135, or both, professional management can reduce much of the operational burden of ownership.

Flight Group Corporation provides aircraft management from its base at Raleigh-Durham International Airport, coordinating services such as:

• Flight scheduling and dispatch
• Flight crew assignment and training
• Maintenance oversight
• Airworthiness documentation
• Long-term maintenance planning
• Insurance coordination
• Hangar coordination
• Trip logistics
• International flight planning
• Financial reporting
• Owner support
• Aircraft presentation and concierge services

Flight Group’s management programs are structured around the aircraft owner’s operating profile and can support both private ownership needs and charter revenue strategies where appropriate.

Part 91 vs. Part 135 Aircraft Management: Which Is Right for You?

Choosing between Part 91 vs. Part 135 aircraft management ultimately comes down to how you want to use your aircraft.

If maximum availability, privacy, and owner-focused scheduling are your priorities, a Part 91 management structure may make the most sense.

If your aircraft spends significant time unused and you want to explore opportunities to offset ownership expenses through charter, Part 135 management may be worth considering.

The decision should account for more than potential revenue.

Consider aircraft usage, maintenance, crew requirements, operational control, insurance, owner availability, regulatory compliance, and long-term aircraft value.

For many owners, the best approach starts with understanding the aircraft’s mission and then building the management structure around it.

At Flight Group Corporation, our team provides comprehensive aircraft management and operational support from Raleigh-Durham International Airport. We help owners coordinate crew, scheduling, maintenance, compliance, financial reporting, and day-to-day aircraft operations while keeping owner priorities at the center of the program.

Talk with Flight Group Corporation about an aircraft management plan built around how you actually fly.

Frequently Asked Questions About Part 91 vs. Part 135

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