What Are IS-BAO Stages 1, 2 and 3?

How it works

IS-BAO stands for the International Standard for Business Aircraft Operations. It is a voluntary code of safety practice published by the International Business Aviation Council (IBAC), an international trade association, not a government regulator. It is not tied to any single jurisdiction: an operator holding a United States FAA Part 135 certificate, a UK or EU Air Operator Certificate, or a certificate from another national authority can all seek IS-BAO registration on the same terms.

The standard centres on a Safety Management System, or SMS: a documented, structured way an operator identifies hazards, assesses risk, records incidents and tracks safety performance over time. An operator is audited against the standard by an independent auditor trained and accredited through the IBAC programme, and the audit produces one of three stage ratings.

Stage 1 means the operator has built and documented an SMS, meaning policies, manuals and procedures, that meets the standard's requirements, but has not yet shown a sustained record of using it. Stage 2 means the operator has shown the SMS is actually functioning: hazards are being reported, risk assessments carried out, and corrective actions tracked in practice, not just on paper. Stage 3 means the SMS is mature and embedded across the organisation, with safety data used for ongoing analysis and continuous improvement rather than treated as a one-off exercise.

Operators typically move through the stages over successive annual or biennial audits, though IBAC does not fix a timetable and the pace varies operator to operator. IS-BAO registration does not replace an operator's legal certificate; it sits alongside it, in the same way that ARGUS Gold vs Platinum and Wyvern Wingman vs Registered ratings sit alongside a certificate, as third-party evidence of a safety culture rather than a licence to fly.

This description reflects how IS-BAO stages are structured as of 28 September 2026; IBAC periodically revises the standard's edition and audit criteria, so the detail of what each stage requires can change.

Cost impact

IS-BAO registration is not a line item on a charter invoice; a charter client never sees an IS-BAO fee quoted separately. Its cost impact is indirect, working through two channels.

First, the operator bears the cost of preparing for and passing the audit, including consultant time, auditor fees and staff hours spent on documentation and training. Suppose, for illustration, an operator spends approximately $20,000 in audit and consulting fees over a year to reach Stage 2. Spread across an illustrative 2,000 flight hours flown that year, that is roughly $10 per flight hour, an amount folded into general overhead rather than billed to any one client.

Second, some insurers and corporate flight departments treat a higher IS-BAO stage as evidence of lower risk, which can translate into a lower insurance premium or preferential treatment in a broker's operator list. Suppose, for illustration, an operator's annual hull and liability insurance is quoted at $180,000 without any recognised safety audit, and the insurer offers an illustrative 5% reduction, or $9,000, for maintaining Stage 2 or higher. That saving accrues to the operator; whether any of it is passed on to a charter client through a lower hourly rate is a matter of the operator's own pricing, not a rule.

Example

Suppose, for illustration, a corporate flight department is comparing two otherwise similar operators for a long-term charter arrangement. Operator A holds IS-BAO Stage 1, meaning its SMS exists on paper but has not been shown to be running day to day. Operator B holds IS-BAO Stage 3, with a mature, data-driven safety programme audited over several years.

Neither stage changes the quoted hourly rate directly, and IS-BAO registration is not itself a charge on any invoice. The practical difference shows up elsewhere: the flight department's own risk policy may exclude Operator A from its approved list until it reaches Stage 2 or 3, narrowing the field of operators it can book with, or Operator B's insurer-linked savings may allow it to hold a marginally lower quoted rate. In this illustration, the stage itself costs the client nothing directly, but it can narrow or widen the pool of operators available at a given price.