What Charter Safety Ratings Actually Mean (and Which to Trust)
ARGUS, Wyvern, and IS-BAO sound interchangeable. They aren't. Here's what each one verifies, and how to read an operator's rating stack.
What Charter Safety Ratings Actually Mean (and Which to Trust)
The first time someone offers you a charter flight, "ARGUS Platinum" and "Wyvern Wingman" get said in the same breath, as if they're brand badges. They aren't. They're three different things doing three different jobs, and a sharp customer can tell within thirty seconds whether their broker actually understands the difference.
Here's what each rating verifies, what it doesn't, and what to ask before you fly.
The regulatory floor: FAA Part 135
Before any rating exists, there's the law. Commercial charter in the United States runs under 14 CFR Part 135, the FAA regulation covering on-demand commercial operations. Part 135 governs pilot training, maintenance, duty time, equipment, and dozens of other things you'd expect a regulator to care about. Part 91 governs private (non-commercial) operations and is significantly less rigorous.
If an operator is selling you a charter flight, they must hold a Part 135 certificate. Non-negotiable. The certificate is the floor.
Safety ratings sit on top of that floor. They are voluntary. None of the three programs below are required by the FAA.
Part 91 vs. Part 135: the short version
Part 91 is the rule set for non-commercial flying. It covers private pilots flying their own aircraft, corporate flight departments flying their own jet for their own people, and recreational aviation generally. There's no requirement for a dispatcher, no drug-testing program, no formal operational-control office. Pilot duty/rest rules are looser, and maintenance follows the manufacturer's recommended program rather than a Part 135-style approved maintenance program.
Part 135 is the rule set for commercial on-demand carriage, what you fly when you charter. It layers on dispatcher oversight, recurrent pilot training every 6 or 12 months depending on aircraft, stricter pilot duty/rest (14 CFR §§135.265 to 135.267), a DOT/FAA-required drug and alcohol testing program, a formal operational control function, and an FAA-approved maintenance program. The operator holds a Part 135 air carrier certificate the FAA can suspend or revoke.
The customer-facing implication: a flight you pay for must be flown under Part 135. If a "charter" is being flown under Part 91 with paying passengers, that's illegal "grey charter". The safety and insurance regime is materially different, and the FAA prosecutes it. Your broker should be able to name the operating Part 135 certificate holder for every quote.
ARGUS: the commercial audit that started it all
ARGUS is a third-party safety auditor. Operators pay ARGUS to audit them; if they pass, they get a public rating that tells customers something about their operational rigor.
The current levels, from entry to top:
- Registered: the operator participates in the program. Not a real safety rating; mostly a marketing presence. Beware of brokers who describe an operator as "ARGUS-rated" when they're only Registered.
- Gold: uses a remote audit to validate the operator's SMS and maintenance practices.
- Gold Certified: adds an on-site audit component to Gold.
- Platinum: adds a full Safety Management System review and tougher safety and procedural standards beyond Gold Certified.
- Platinum Elite: the highest tier. To qualify, an operator must have completed at least two consecutive Platinum audits with no significant findings, have operated as Platinum-rated for four years or more, and participate in a continuous monitoring program (reviews every six months, plus a company-wide review every two years).
What ARGUS checks: pilot training records, maintenance logs, hull insurance levels, accident/incident history, drug and alcohol program compliance, and the operator's safety management practices. It is paperwork-heavy by design. That's the point.
Wyvern: the other major rater
Wyvern is the other commercial auditor, with a similar but distinct methodology. Their top tier is Wingman, which requires an on-site safety audit (typically a two-day site visit by Wyvern's safety advisors) and ongoing performance monitoring, with follow-up audits every 24 months. (The brief originally said 18 months; fact-check against the Wyvern Wingman page and corroborating trade-press summaries confirmed 24 months.)
The mental model: ARGUS and Wyvern both blend document review with on-site audits, but they use different methodologies and standards. Neither is universally "better." Many operators carry both, and good ones often carry both plus IS-BAO.
If you only remember one thing about Wyvern: when a broker mentions "Wyvern" without specifying Wingman, ask whether the operator is registered or certified. The distinction matters.
IS-BAO: the standards body, not an audit
IS-BAO is the odd one out. It's published by the International Business Aviation Council (IBAC) and is a standard the operator implements internally. It has three stages:
- Stage 1: confirms that the SMS infrastructure is established and that safety management activities are appropriately targeted.
- Stage 2: ensures that safety risks are being effectively managed.
- Stage 3: verifies that safety management activities are fully integrated into the operator's business and that a positive safety culture is being sustained.
NBAA (the industry's trade association) publicly endorses IS-BAO as a leading SMS framework for business aviation. A Stage 3 operator has demonstrated something a fresh rating can't: time.
How to read an operator's rating stack
A common "gold standard" stack runs roughly: ARGUS Platinum (or Elite) + Wyvern Wingman + IS-BAO Stage 3. This is rare. Most reputable operators carry one or two of the three.
What it means in practice:
- All three: the operator is investing real money and management attention in being verifiable. They want to be the kind of operator a Fortune 500 risk department clears without a phone call.
- Two of three: standard for a serious mid-to-large operator. Ask which two, and why.
- One: could be excellent or could be just-enough-for-the-marketing-page. Ask follow-ups.
- Zero: not automatically unsafe. Some excellent owner-operators carry no commercial ratings because the audit cost doesn't pencil out for a one-aircraft operation. The unrated operator is harder to verify, not harder to vouch for if you have other signals.
Now that you can read a rating stack, put it to work on a real trip. Search your route at lookbookandfly.com/search and we'll come back with quotes that name the operating Part 135 certificate holder and its ARGUS, Wyvern, and IS-BAO standing, so you can compare on safety, not just price. Prefer to talk it through? Call 800-602-5678 anytime and our team will walk you through the operator options behind each quote.