---
title: "Part 91 vs Part 135: What It Means for Private Jet Owners and Passengers"
description: "Part 91 vs Part 135 explained for private jet owners and passengers: who can fly under each, what changes for safety, crew and cost, and what to ask."
image: https://www.crewblast.co/hubfs/Owning%20an%20Aircraft%20vs%20Charter.jpg
---

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 Nov 13, 2026, 9:00:00 AM

# Part 91 vs Part 135: What It Means for Private Jet Owners and Passengers

[CrewBlast](https://www.crewblast.co/blog/author/crewblast)

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If you fly privately, you will hear two numbers more than any others: 91 and 135. They come from the Federal Aviation Regulations, and they decide who is allowed to fly an aircraft, who can sell a seat on it, and what standards the flight must meet. Most owners and passengers never read the regulations, yet the difference between Part 91 and Part 135 shapes the safety, the legality, and the price of nearly every private trip.

This guide explains the difference in plain language for owners, charter clients, and the advisers who support them. It covers what each part governs, how crews are treated differently, where management companies and fractional programs fit, and the questions that protect you before you book. For the crew side of the same topic, the CrewBlast guide to [**Part 91 and Part 135 crew requirements**](https://www.crewblast.co/blog/part-91-vs-part-135-crew-requirements-what-operators-must-know) is a useful companion.

## THE SIMPLE RULE OF THUMB

 

Part 91 is for flying your own aircraft for your own purposes. Part 135 is for selling flights to others. If someone is paying to be flown, the flight should be operated by a company holding a Part 135 certificate that covers the aircraft you will actually fly.

## What Part 91 Covers

 

Part 91 contains the general operating and flight rules that apply to almost every aircraft in the United States. It is also the rule set under which private operations are conducted: a company flying its executives in its own jet, a family flying its own aircraft, or a management company operating an aircraft for its owner. In these cases the operator is not offering transportation to the public for compensation.

Part 91 does not require an air carrier certificate or an approved training program for most operators. That does not mean Part 91 flying is careless. Many Part 91 flight departments hold themselves to standards that match or exceed Part 135, and they undergo independent audits. It simply means the regulations themselves are less prescriptive.

## What Part 135 Covers

 

Part 135 governs commuter and on demand operations, which is the regulatory home of private jet charter. A company that sells flights to the public must hold an air carrier certificate and operate under operations specifications that define what aircraft it may use and what kind of flying it may do. The aircraft you fly must be authorized under that certificate.

The regulations are more prescriptive in nearly every area. Pilots must meet higher qualification standards and be trained and checked under the operator's approved program. Maintenance follows an approved program. Flight and duty time and rest rules apply. Operators must run drug and alcohol testing programs and maintain operational control of each flight. These requirements are the reason charter costs more than a simple trip in an owner's aircraft.

## Side by Side: What Actually Changes

 

For crew, the difference is large. A Part 91 pilot must meet the general certificate, medical, and currency rules. A Part 135 pilot must also be approved under the operator's program, and captains of turbojet aircraft generally must hold an Airline Transport Pilot certificate with the appropriate type rating. The [**overview of pilot training and currency standards**](https://www.crewblast.co/blog/pilot-training-and-currency-standards-for-private-jets) explains the details.

For duty time, Part 135 sets specific limits and rest requirements, while Part 91 relies on the general requirement to operate safely. For maintenance, Part 135 uses approved maintenance programs and tighter record keeping. For oversight, Part 135 operators are certificated and inspected by the FAA as air carriers. The [**guide to pilot duty time limits**](https://www.crewblast.co/blog/pilot-duty-time-limits-part-91-vs-part-135-explained) shows how this plays out day to day.

## Where Management Companies Fit

 

Most owners who hire a management company fly under Part 91. The management company supplies crew, maintenance coordination, and scheduling, but the flights remain private operations for the owner. The owner stays in control of when and where the aircraft flies.

Some owners also authorize charter use of the aircraft. In that case the aircraft is added to a Part 135 certificate and flown by the certificate holder for charter customers, while the owner's own trips continue under Part 91. The CrewBlast guide to [**aircraft management by manufacturer**](https://www.crewblast.co/blog/aircraft-management-by-manufacturer-what-gulfstream-falcon-and-challenger-owners-should-know) and the [**benefits of aircraft management companies**](https://www.crewblast.co/blog/the-benefits-of-aircraft-management-companies-for-private-jet-owners) describe how these arrangements work.

## Fractional Ownership and Other Variations

 

Fractional ownership programs operate under a separate subpart of Part 91 that sets additional safety requirements for those programs. Jet card programs usually sell flights that are operated by a Part 135 certificate holder. The structure can look similar to the customer, but the regulatory basis differs, which is why it pays to ask who the operator is and under which rules the flight will be conducted.

## The Illegal Charter Problem

 

The most serious risk for passengers is a flight that is sold like charter but operated as a private flight. This is often called illegal charter. It can happen when an owner or a company offers seats for payment without a Part 135 certificate, or when a certificate holder uses an aircraft that is not on its certificate.

The consequences can be severe. Insurance may not cover the flight, and the passenger can face serious safety and liability problems. If you are paying for transportation, confirm the operator and the aircraft before you pay. The [**overview of WYVERN and ARGUS safety ratings**](https://www.crewblast.co/blog/wyvern-and-argus-safety-ratings-in-business-aviation-what-they-are-and-why-they-matter-for-crew) explains additional checks that sophisticated clients use.

## Questions to Ask Before You Fly

 

Ask which company will operate the flight and hold operational control. Ask for a copy of its air carrier certificate and confirmation that the specific aircraft is authorized. Ask for proof of insurance. Ask how pilots and flight attendants are qualified and vetted, including contract crew. Ask whether the operator holds an independent safety rating.

Operators that welcome these questions are usually the ones that run disciplined operations. Vague or defensive answers are worth noting. A short written confirmation of the operator, the aircraft, and the insurance is a reasonable request on any paid flight.

## How Crew Sourcing Differs Between the Two

 

Crew sourcing is where the two rule sets diverge most in daily operations. A Part 91 department can often place a qualified contract pilot quickly, while a Part 135 operator must make sure the pilot is approved under its training program before the flight. That is why Part 135 operators usually build a bench of approved contract crew in advance.

CrewBlast supports both. Operators can send a [**crew request**](https://www.crewblast.co/crewblast-request) that specifies Part 91 or Part 135 requirements and see verified responses in an average of 39 seconds, and flight departments that source regularly can build preferred contractors in [**CrewBlast OS**](https://www.crewblast.co/crewblast-os). Every crew member completes [**CertiFly verification**](https://www.crewblast.co/certifly) with CLEAR biometric identity confirmation.

## How the Rules Affect Cost

 

The regulatory difference shows up in price. A Part 135 operator carries costs that a private flight department does not: air carrier oversight, approved training and maintenance programs, drug and alcohol testing, additional insurance, and dedicated operational control staff. Those costs are built into charter rates. They are also the reason charter clients receive a documented safety framework that a casual private arrangement cannot offer.

For owners, the same logic applies in reverse. Placing an aircraft on a charter certificate can offset fixed costs through charter revenue, but it also adds maintenance cycles, crew approvals, and compliance work. The decision is a trade off, not a free benefit, and it should be made with a clear view of the rules that follow the aircraft onto the certificate

## Common Myths About Part 91 and Part 135

 

The first myth is that Part 91 flights are unsafe. Many are operated by highly professional flight departments with rigorous standards. The second is that Part 135 guarantees a perfect record. It sets minimum standards, but quality still varies between operators. The third is that the two are interchangeable. They are not, and mixing them up is how illegal charter happens.

A fourth myth is that crew approval is a formality. In Part 135, a pilot who is not approved under the operator's program cannot fly revenue passengers, however experienced. Understanding this is why operators build approved benches ahead of time instead of searching on the day of the trip.

Part 91 and Part 135 are not good and bad. They are different rule sets for different kinds of flying. Owners flying their own aircraft operate under Part 91, passengers buying a flight should expect a Part 135 operator, and the structures in between, from management to fractional programs, each have their own rules. Knowing which one applies lets you ask the right questions and avoid the costly mistakes.

## Related posts

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## [Part 91 vs Part 135 Crew Requirements: What Operators Must Know | CrewBlast](https://www.crewblast.co/blog/part-91-vs-part-135-crew-requirements-what-operators-must-know-crewblast)

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 Apr 27, 2026, 9:00:01 AM

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 Oct 2, 2026, 11:00:00 AM

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## [What Is Private Aircraft Management? A Complete Guide for Jet Owners in 2026](https://www.crewblast.co/blog/what-is-private-aircraft-management-a-complete-guide-for-jet-owners-in-2026)

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 Oct 29, 2026, 9:30:00 AM

Private aircraft management is the arrangement where a specialist company operates a business jet...

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