AS9100 vs ISO 9001: Key Differences Explained
13 April 2026
AS9100 vs ISO 9001 is one of the most common comparisons in aerospace and manufacturing. Both standards define requirements for a Quality Management System (QMS), but they serve different needs.
ISO 9001 applies to any organization. It focuses on customer satisfaction and continual improvement.
AS9100 is specifically for aerospace, aviation, and defense. It builds on ISO 9001 and adds strict safety, traceability, and regulatory requirements.
In this guide, we explain the core differences, help you decide which standard applies, and – where relevant – how to integrate both. For over two decades, the experts at 9001Simplified have guided companies through ISO 9001 and AS9100 certification, building systems that are practical, auditable, and efficient.
What is ISO 9001?
ISO 9001 is the world's most widely adopted quality management standard. Published by ISO (the International Organization for Standardization), it provides a framework for any organization to build an effective Quality Management System (QMS) – regardless of industry or size. See our detailed guide: "What Is ISO 9001?".
Key facts:
Current version: ISO 9001:2015
Over 1 million certified organizations worldwide
Focus: customer satisfaction, process efficiency, and continual improvement
ISO 9001 certification signals to customers and regulators that your company delivers consistent quality. It is often a requirement for government contracts and can streamline compliance in non-aerospace sectors.
We offer a full range of ISO 9001 solutions – from a DIY toolkit and online training to full-service consulting and internal audits – but more on that below.
What is AS9100?
AS9100 is a specialized quality management standard designed for the aviation, space, and defense industries. It is managed by the International Aerospace Quality Group (IAQG) and includes all ISO 9001 requirements, adding over 100 extra aerospace- and defense-specific requirements.
Key facts:
Current version: AS9100:2016 (Rev D)
Mandatory for most aerospace suppliers
Focus: flight safety, product traceability, counterfeit prevention, and regulatory compliance
For top-tier manufacturers (like Boeing, Airbus, and Lockheed Martin) and their direct suppliers, AS9100 certification is often a mandatory requirement. However, the demand for AS9100 varies further down the supply chain. Many defense contracts, particularly those for non-critical components, general services, or raw materials, only require a robust ISO 9001 system.
For AS9100, we provide a full range of consulting support – from gap analysis and implementation to internal auditing and certification assistance.
AS9100 vs ISO 9001: Core Differences
Although both standards define requirements for a Quality Management System (QMS), their scope and intent differ significantly. ISO 9001 is a general quality standard. AS9100 is a safety-critical standard for aerospace.
Here are the most important differences:
Area
ISO 9001:2015
AS9100:2016 (Rev D)
Industry scope
Universal – any organization, any industry
Aerospace, aviation, and defense only
Risk management
General risk-based thinking required
Emphasis on flight safety and operational risk
Product traceability
Not specifically required
Mandatory – full traceability from raw material to delivery
Counterfeit parts
Not mentioned
Explicit prevention and control requirements
Configuration management
Not required
Formal configuration management required
Supplier management
Basic supplier evaluation
Strict monitoring and flow-down requirements
Product safety
Limited requirements
Central focus – safety during manufacturing and delivery
Documentation
Flexible – organizations determine level needed
Extensive – detailed aerospace-specific records required
Certification demand
Often voluntary, sometimes customer-required
Mandatory for top-tier aerospace and defense contractors and their major suppliers
Should I Get AS9100 Certification?
Not every company that touches aerospace needs AS9100 certification. The answer depends on your role in the supply chain and your customers' requirements.
Your Role
Required?
May Choose Voluntarily?
Our Recommendation
Aerospace manufacturer
(produces parts or assemblies)
✅ Yes – customers require it
N/A
Get AS9100 certified.
Machine shop
(supplies to aerospace primes)
✅ Usually yes – primes demand it
N/A
Get AS9100 certified to qualify for contracts.
Distributor
(sells aerospace components)
❓ Sometimes – depends on customers
✅ Yes – shows commitment to quality
Start with ISO 9001. Add AS9100 if customers require it.
Raw material supplier
(metal, plastic, composites)
❌ Rarely
✅ Yes – large customers may prefer it
ISO 9001 is usually sufficient. Add AS9100 only if required.
Maintenance / repair / overhaul (MRO)
❓ Sometimes – depends on the regulator
✅ Yes – builds customer trust
Check customer and regulatory requirements.
The bottom line: If you want to sell directly to aerospace primes or their tier-1 suppliers, AS9100 is almost always required. If you are further down the supply chain (raw materials, distribution), ISO 9001 may be enough.
Not sure if AS9100 is required – or just beneficial – for your business? Contact us for a free consultation. We will help you assess your customer requirements and market opportunities.
Do I Also Need ISO 9001?
Many businesses ask whether they need both AS9100 and ISO 9001 certification.
The short answer: No. AS9100 fully includes ISO 9001. If you have AS9100, you already meet all ISO 9001 requirements.
Here is why: AS9100 was built directly on ISO 9001. It takes every ISO 9001 clause and adds aerospace-specific requirements. A company certified to AS9100 is automatically compliant with ISO 9001 – even if they do not hold the separate certificate.
So why do some companies hold both?
Marketing to non-aerospace customers – Some customers outside aerospace recognize ISO 9001 but not AS9100.
Contract requirements – Some contracts, especially in government IT procurement, explicitly ask for ISO 9001 certification. For example, NASA's Solutions for Enterprise-Wide Procurement (SEWP) VI contract mandates an active ISO 9001:2015 certification (or our guarantee) to even bid, without accepting AS9100 as a substitute.
Internal confusion – Some companies simply do not realize AS9100 includes ISO 9001.
Our honest advice: For aerospace work, AS9100 alone is sufficient and preferred. We do not push ISO 9001 on AS9100-certified companies unless you have a specific non-aerospace customer who demands it. If you need both for a particular contract, we can add ISO 9001 as a separate certificate – but it adds no operational value beyond what AS9100 already provides.
Contact us for advice if you are not sure.
Real-World Examples
Let us look at practical examples to see which standard fits different situations.
A machine shop producing structural brackets for a defense prime like Lockheed Martin. Because the part is critical and the customer is a top-tier contractor, they must have AS9100 certification.
An IT services provider bidding on a contract for a defense logistics agency. The contract focuses on service delivery and data security, not on manufacturing hardware. In this case, a solid ISO 9001 certification is likely sufficient and more appropriate.
A metal distributor selling aluminum sheet to both aerospace and general industry. For their non-aerospace work, ISO 9001 is sufficient. However, if their largest aerospace customer demands AS9100 to maintain their own compliance, the distributor may need to upgrade.
The difference comes down to your role in the aerospace supply chain, your customer requirements, and the safety-critical nature of your product.
Certification Process: AS9100 vs ISO 9001
Both standards follow a similar certification process:
1. Gap Analysis – Identify current compliance level
2. Documentation – Develop policies, procedures, and records
3. Implementation – Train employees and apply processes
4. Internal Audit – Verify compliance before certification
5. Certification Audit – Conducted by an accredited registrar
ISO 9001 certification usually takes 2–6 months. AS9100 certification may take longer due to more extensive controls and audits.
Integrated AS9100 & ISO 9001 Systems
For companies that genuinely need both certificates (e.g., they serve both aerospace and non-aerospace markets that demand different certifications), we build one integrated QMS that satisfies both standards.
Because AS9100 already includes ISO 9001, this is straightforward. We start with AS9100 requirements (the stricter set) and ensure the system also meets any ISO 9001-specific documentation preferences.
The result:
One set of procedures
One set of records
One internal audit program
One management review
Two certificates (AS9100 and ISO 9001) – if both are needed
Timeline: For most aerospace companies, we can implement AS9100 (or both) in 6–12 months depending on your existing QMS.
Contact us to learn more about our implementation approach.
Conclusion
AS9100 vs ISO 9001 is not about choosing the "better" standard but the right one for your industry. ISO 9001 suits all businesses, while AS9100 is required for most aerospace and for certain defense supply chains.
Over the past two decades, we have guided hundreds of companies through ISO 9001 and AS9100 certification. We have seen what works – and what wastes time and money. Here are some final tips:
Do not over-certify. If ISO 9001 is enough for your customers, stop there.
Do not under-certify. If you want to sell into aerospace supply chains, AS9100 is the price of entry.
Remember that AS9100 includes ISO 9001. Do not pay for both unless you have a specific reason.
We are happy to answer questions – even if you never become a client. That is how we have built our reputation. So, contact us to book a free consultation.
