In 2022, the FAA recorded 1.04 total accidents per 100,000 flight hours for Part 135 operators — but that aggregate figure masks wide variances between fleets that undergo audited safety programmes and those that do not. For high-net-worth charter clients, the difference between a Wyvern Wingman–rated operator and an unrated one can be the difference between a documented safety management system and a company that merely meets minimum federal requirements.
The Regulatory Bedrock: Part 135 versus Part 91
Private jet operations in the United States fall under two primary Federal Aviation Administration (FAA) regulatory frameworks: Part 91 governs private, non-commercial flight, while Part 135 regulates on-demand charter operations. The distinction is critical. A Part 91 operator—often the flight department of a corporation or an individual owner—faces no requirements for pilot duty-time limits, drug and alcohol testing, or mandatory recurrent training beyond the basic biennial flight review. In contrast, Part 135 operators must adhere to structured crew training programmes (e.g., initial, transition, and recurrent), random drug testing, and 1,200 hours of flight experience for pilot-in-command qualification.
Yet many fractional ownership and jet-card programmes—such as NetJets, Flexjet, and Wheels Up—operate under Part 135 certificates, meaning their crews are subject to these higher standards. Charter companies that base operations abroad may hold equivalents like EASA Part-OR.OPS in Europe. A typical hourly rate for a light jet (e.g., Cessna Citation CJ3+) under Part 135 ranges from $2,800 to $3,800; for a heavy jet (e.g., Gulfstream G650), rates climb to $7,500–$10,000 per hour. These rates reflect not only aircraft costs but also the compliance overhead of Part 135—safety audits, maintenance tracking, and crew training.
ARGUS and Wyvern — What Their Ratings Actually Certify
ARGUS International and Wyvern are the two dominant third-party safety auditors in business aviation. Their ratings are not a pass/fail on individual flights; they assess an operator’s Safety Management System (SMS), maintenance procedures, pilot qualification files, and operational documentation. ARGUS Platinum requires a fully integrated SMS, internal audit programme, Flight Operational Quality Assurance (FOQA) data collection, and a documented safety culture. As of 2024, fewer than 200 operators worldwide hold Platinum status, including Jet Aviation, Gama Aviation, and Executive Jet Management. The lower-tier ARGUS Gold or Silver indicates a less comprehensive SMS.
Wyvern’s Wingman standard is similarly rigorous, requiring a third-party audit of the operator’s safety culture, flight data monitoring, and crew resource management. The Wyvern Registered designation is a lighter check that verifies insurance, regulatory compliance, and basic safety documentation. Neither organisation guarantees a zero-accident record; in 2019, a Wyvern Wingman–rated operator (Fly Guard) experienced a fatal crash in Nigeria, highlighting that audits assess systems, not outcomes. For charter brokers and clients, the practical rule of thumb is that ARGUS Platinum or Wyvern Wingman is the gold standard; any operator without at least ARGUS Gold or Wyvern Registered should raise scrutiny.
Beyond the Certificate: Operational Nuances That Matter
A safety rating alone does not account for real-world variables: the specific aircraft model’s accident history, the age of the fleet, the pilot’s total time in type, or the operator’s track record on international operations. For example, a charter company flying a 20-year-old Cessna Citation Excel may hold ARGUS Gold, yet its accident risk profile differs from a newer Phenom 300 operated by a Wyvern Wingman firm. Data from the National Transportation Safety Board (NTSB) shows that Part 135 fatal accident rates for turbine aircraft have hovered around 0.36 per 100,000 flight hours over the past decade, but the rate for single-engine turbine operations (often used in air taxi services) is notably higher than for multi-engine jets.
Another nuance is the use of Part 91 on-demand operations by some brokers who claim to offer charter but contract with aircraft owners flying under non-commercial rules. This arrangement is legal only if the owner is not holding out the aircraft to the public; in practice, some operators blur the line. Verifying that the flight will be conducted under a valid Part 135 certificate — traceable via the operator’s FAA-issued OpSpecs — is essential. Prudent clients also request evidence of recent flight crew training records and ask whether the operator participates in FOQA or a voluntary safety reporting system.
How to Scrutinise an Operator’s Safety Record
The most direct method is to ask the charter broker or operator for the specific rating level — not just “we are ARGUS/Wyvern compliant” but the actual tier (e.g., ARGUS Platinum or Wyvern Wingman). These designations are public on the auditors’ websites. A reputable operator will provide a copy of their Safety Certificate and the audit date. Additionally, request the operator’s N-number (tail registration) and check the FAA’s Aviation Safety Information Analysis and Sharing (ASIAS) database for any enforcement actions or incidents.
Third-party databases like the Aviation Safety Network and the NTSB accident database list incidents involving specific registrations. For example, a search for “N12345 accident” can reveal collision histories. However, minor incidents (e.g., runway excursions, bird strikes) may not appear in public databases; the operator’s own safety reports are more revealing but rarely shared. The International Standard for Business Aircraft Operations (IS-BAO) , run by the International Business Aviation Council (IBAC), also offers a third-stage audit (IS-BAO Stage 3) that certifies an advanced SMS. An operator with IS-BAO Stage 3, ARGUS Platinum, and Wyvern Wingman — such as Bombardier’s Charter Network or VistaJet — provides the highest degree of documented safety infrastructure.
Accident Statistics: Separating Signal from Noise
Business aviation’s overall safety record is strong but uneven. According to the NTSB’s 2022 preliminary data, Part 135 operators logged a total accident rate of 1.04 per 100,000 flight hours (fatal: 0.36). For Part 91 non-commercial operations, the total accident rate was 5.92 per 100,000 hours (fatal: 1.01). For comparison, Part 121 airlines (scheduled carriers) recorded a fatal accident rate of 0.07 per 100,000 hours. The 5.7x difference between Part 135 and Part 91 underscores the safety benefit of regulatory oversight. Yet within Part 135, the accident rate is driven disproportionately by smaller operators and single-engine turbine flights. A study by the University of Nebraska Omaha (2021) found that operators with fewer than 10 aircraft have a fatal accident rate 2.3 times higher than those with fleets of 50 or more.
Another key insight: the accident rate for heavy jets (e.g., Gulfstream, Bombardier Globals) is significantly lower than for light jets and turboprops, partly due to more experienced crews and higher maintenance standards. However, the absolute risk remains small — the odds of a fatal accident on a Part 135 charter flight are approximately 1 in 275,000 flight hours. For a client flying 100 hours per year over 20 years, the lifetime risk is about 0.007%. The real value of third-party audits lies not in eliminating infinitesimal risks but in ensuring that an operator’s systems, culture, and training are consistently applied.
