What determines your risk on a private jet is not the “private versus commercial” label at the point of sale — it’s the operator’s regulatory category and oversight posture. US civil aviation splits into Part 91 (private and corporate), Part 135 (on-demand charter), and Part 121 (scheduled airlines), each with different training, maintenance, and oversight obligations.
In 2024, eight fatal business-jet accidents killed 21 people. But operator-level safety data is not standardized or fully public, so travelers have to rely on proxies — the FAA’s Part 135 list and voluntary audit programs — rather than a simple safety score.
Two business jets sit on the same ramp at the same FBO. Same aircraft type, same crew uniforms, same coffee in the lounge. One is flying under Part 91, the other under Part 135.
From the cabin, you cannot tell them apart. From the rulebook, they are different animals.
That gap is the whole story. Most travelers assume the meaningful distinction in private aviation is private versus commercial — a charter flight is “commercial,” an owner’s flight is “private,” and the commercial one is presumably safer. The regulatory reality is messier, and more useful, than that.
The FAA sorts civil aviation into categories that have nothing to do with how the cabin looks. Scheduled airlines fly under Part 121. On-demand charters fly under Part 135.
Private and corporate flights — including owner-flown aircraft — fly under Part 91. Each category carries its own training, maintenance, and oversight obligations, and those obligations eventually show up in the accident record.
What the public data does not give you is the thing you’d actually want before booking: a clean, comparable safety score for the specific operator flying your trip. That data largely doesn’t exist in public form. So the practical question becomes not “is private aviation safe,” but “which rules is this flight operating under, and who is enforcing them.”
Three sets of rules, one cabin
The category a flight operates under is set by the certificate behind it, not by the aircraft or the passenger. A Part 135 operator holds an FAA certificate to fly charter or air-taxi trips for hire. A Part 91 flight is private or corporate flying — no certificate to carry paying passengers on demand, and no Part 135 obligations attached.
That distinction carries real weight. Part 135 charter operations face structured maintenance programs, mandatory pilot training, and more rigorous FAA oversight than private flying. Part 121 scheduled airlines sit at the top of the stack, with the highest regulatory and oversight category of the three.
Here’s the part most coverage skips. In the United States, the overwhelming majority of civil aviation accidents and fatalities occur within general aviation — the broad category that includes owner-flown Part 91 aircraft. Owner-flown operations tend to show higher fatal accident rates per flight hour than professionally crewed charter work.
But that comparison rests on a category wider than business jets alone: piston singles, light aircraft, and everything else in general aviation are bundled into the same bucket.
So the claim that owner-flown Part 91 business jets carry the most risk is an inference from a broader category, not a settled business-jet-only finding. The reviewed FAA and NTSB material does not break out Part 91 business-jet accidents from the rest of general aviation. That precision matters, because it’s the difference between a defensible trend and an overstated one.
What the 2024 numbers can and can’t tell you
The most current confirmed snapshot is 21 fatalities across eight fatal business-jet accidents in calendar year 2024, drawn from a global business-jet fleet dataset. The same dataset puts the 2024 business-jet fatal-accident rate at roughly 0.04 per 100 aircraft.
Read that rate carefully. It is per aircraft, not per flight hour — a different denominator than the per-100,000-hour figures you’ll see quoted elsewhere. The two are not interchangeable, and treating them as such is one of the easier ways to get this topic wrong.
The 2019 comparison figure that circulates in some coverage — 77 business-jet fatalities — is not confirmed by the primary sources reviewed here. Neither are the specific Part 135 rates of 0.76 total and 0.201 fatal accidents per 100,000 flight hours. Until an underlying FAA, NTSB, or equivalent dataset backs them up, both sets of numbers should be treated as unverified.
What the evidence does support is directional: Part 135 charter operations carry stricter oversight than Part 91 private flying, and the accident record reflects that. The exact size of the gap is where the public data runs out.
| Attribute | Part 91 | Part 135 | Part 121 |
|---|---|---|---|
| Oversight authority | FAA rules for general aviation/private operations; no Part 135 certificate is implied | FAA certificate required for charter or air-taxi operations | FAA rules for scheduled airline operations |
| Pilot training requirement | Specific business-jet-only comparison not verified in the reviewed primary material | More stringent operational requirements than private flying; exact business-jet comparison not verified here | Highest regulatory and oversight category among the three |
| Maintenance program | Business-jet-specific requirement not verified from the reviewed material | Structured/approved maintenance requirements are described in the supplied evidence | Exact comparable maintenance provision not extracted from the reviewed material |
| SMS mandate status | Not generally covered; qualifying §91.147 LOA holders subject to SMS by May 28, 2027 | Existing certificate holders generally have until May 28, 2027; new applicants after May 28, 2024 must have SMS during certification | Exact comparable status not extracted from the reviewed material |
| Fatal accident rate per 100,000 flight hours | Not verified for business-jet-only Part 91 operations; the available general-aviation category is broader | Requested 0.76 total and 0.201 fatal figures not verified; NTSB notes rates fluctuate | Exact rate not verified in the reviewed material |
| Source: Federal Aviation Administration (FAA); National Transportation Safety Board (NTSB) | |||
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Why the SMS rule is a forward-looking variable, not a proven fix
The FAA’s Part 5 Safety Management Systems rule took effect on May 28, 2024. It requires Part 135 charter operators to build a formal SMS — a structured way of identifying and managing operational risk before it turns into an accident.
Compliance unfolds in phases rather than all at once. For operators already holding a Part 135 certificate, the deadline to build and roll out an SMS and file a declaration of compliance is generally May 28, 2027. Anyone applying for a new Part 135 certificate on or after May 28, 2024 must have an SMS in place during certification.
There’s a wrinkle worth knowing: the mandate isn’t confined to Part 135. Part 91 operators holding a qualifying §91.147 letter of authorization — typically air-tour or certain commercial sightseeing operations — are also subject to the SMS requirement by the same 2027 deadline.
What the rule has not yet produced is measurable safety gain. The mandate is recent enough that outcome data does not exist, and the reviewed evidence shows no verified split by operator size. Treat it as a variable to watch, not a trend already in motion.
What this means for you
Start by getting the legal operating carrier and the assigned aircraft registration from the broker, then confirm both against the FAA’s Part 135 list. That list refreshes each week and can be searched by operator name, doing-business-as name, or aircraft registration. What it establishes is legal charter authority — not a comparative safety score.
Next, ask which ARGUS, Wyvern, or IS-BAO designation the operator currently holds, at what tier, along with the date of its most recent audit. Ask for the operator’s name, not just the broker’s.
Each program evaluates a different dimension — IS-BAO gauges how mature an operator’s safety-management system is, while ARGUS and Wyvern apply their own evaluation frameworks.
Then ask the question the “private jet” label quietly dodges: will this flight operate under Part 135 or under private Part 91 authority? A bare “safety rated” claim with no named program, no level, no audit date, and no match to the operating carrier should be treated as insufficient. A review by Bravo found no shared industry-wide scale and no single authoritative public database behind these ratings.
One more check worth doing: verifying a single tail number is narrower than assessing the operator as a whole. The aircraft assigned to your trip may be one of many the operator flies. When the trip is over, store the certificate and rating documents with the booking record.
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Key terms
- Part 91
- Part 91 is the FAA rule set covering private and corporate flying, including aircraft flown by their owners. Flights under Part 91 hold no certificate to carry paying passengers on demand, so they carry fewer of the training, maintenance, and oversight obligations that apply to charter work. For a traveler, the practical consequence is that a “private” label says nothing about oversight — only the certificate behind the flight does.
- Part 135
- Part 135 is the FAA category for on-demand charter and air-taxi operations flown for hire. Operators in this category must hold an FAA certificate and meet structured maintenance, pilot-training, and oversight requirements that private flying does not. Because Part 135 operators are the ones most travelers actually fly with when they book a charter, the certificate — not the aircraft — is the thing worth verifying before a trip.
- SMS (Safety Management Systems)
- A Safety Management System, or SMS, is a formal, documented process an operator uses to identify and manage operational risk before it becomes an accident. The FAA’s Part 5 rule, effective May 28, 2024, requires Part 135 charter operators to build one, with existing certificate holders generally given until May 28, 2027 to implement it and file a declaration of compliance. Because the mandate is still phasing in, an operator’s SMS status today says more about its paperwork timeline than about its measured safety record.
- IS-BAO
- IS-BAO, the International Standard for Business Aircraft Operations, is a voluntary audit program that measures how mature an operator’s safety-management system is. It sits outside FAA certification, and the reviewed evidence does not establish a common industry-wide scale or a single authoritative public database covering it alongside ARGUS and Wyvern. For a traveler, an IS-BAO designation is only meaningful when paired with the specific tier and the date of the most recent audit — a bare “rated” claim tells you little.
- FBO
- An FBO, or fixed-base operator, is the business that provides ground services such as fueling, hangaring, and passenger handling at an airport. Private and charter flights typically depart from an FBO rather than an airline terminal, which is why two very different operations can share the same lounge. In this article, the FBO is the setting where the Part 91 and Part 135 distinction becomes invisible — the ramp and the cabin look identical even when the rules behind them do not.
Questions? Answers.
Can I check a private jet operator’s safety record before I book?
You can verify legal charter authority, but not a comparative safety score. You can search the FAA’s Part 135 operator list — refreshed each week — by operator name, doing-business-as name, or aircraft registration; use it to confirm the legal carrier and aircraft before you book.
Is a Part 135 charter safer than an owner-flown Part 91 flight?
Directionally, yes — Part 135 operations carry stricter oversight, training, and maintenance requirements than private Part 91 flying. But the exact gap is not verifiable from the reviewed material: no fatal accident rate per 100,000 flight hours exists for Part 91 business jets alone, and the requested Part 135 figures of 0.76 total and 0.201 fatal were not confirmed. The 2024 baseline is eight fatal business-jet accidents and 21 fatalities.
What do ARGUS, Wyvern, and IS-BAO ratings actually tell a traveler?
They are voluntary programs that sit outside FAA certification, and each evaluates a different dimension of an operator’s safety posture. No shared industry-wide scale or single authoritative public database covers these ratings, so a “rated” claim without a named program, tier, and audit date tells you very little.
Has the 2024 Part 135 SMS rule already made charter flying safer?
Not measurably — the rule is too recent for outcome data to exist. It took effect May 28, 2024, and existing certificate holders generally have until May 28, 2027 to implement an SMS and file a declaration of compliance. New applicants submitting on or after May 28, 2024 must have an SMS during certification.
