Part 91 vs Part 135 Crew Requirements Explained
Understanding the difference between Part 91 and Part 135 operations is essential for any business aviation operator. These regulations not only define how flights are conducted, but also determine how pilots are hired, trained, and deployed.
For flight departments using contract pilots, this distinction becomes even more important. The requirements under each regulation directly impact compliance, documentation, and operational flexibility.
This guide explains the key differences between Part 91 and Part 135 crew requirements and how they affect pilot staffing decisions.
1. What Are Part 91 and Part 135 Operations
In the United States, business aviation operations fall under different regulatory frameworks depending on the nature of the flight.
Part 91 Operations
Part 91 applies to private, non-commercial flights. These include:
- Corporate flight departments
- Privately owned aircraft
- Owner-operated business jets
Under Part 91, operators have more flexibility in how they manage crew and operations, as long as safety and regulatory requirements are met.
Part 135 Operations
Part 135 applies to commercial charter operations where passengers pay for the service.
These include:
- Charter companies
- Air taxi services
- Aircraft management companies offering charter
Part 135 operations are more tightly regulated, with specific requirements for pilot training, documentation, and operational procedures.
2. Key Differences in Crew Requirements
The biggest differences between Part 91 and Part 135 come down to structure and oversight.
Flexibility vs Structure
Part 91:
- More flexibility in hiring and scheduling pilots
- Operators can engage contract pilots more freely
- Fewer procedural requirements compared to Part 135
Part 135:
- Strict operational control and oversight
- Pilots must be integrated into the operator’s approved system
- Defined procedures for training, checking, and documentation
Training and Checking Requirements
Part 91:
- Operators ensure pilots are qualified and current
- Less formalized training structure
Part 135:
- Mandatory training programs approved by the FAA
- Regular check rides and recurrent training
- Company-specific qualification requirements
Documentation and Compliance
Part 91:
- Basic documentation requirements
- Focus on licensing, medical, and currency
Part 135:
- Extensive documentation and record-keeping
- Detailed operational manuals and procedures
- Strict compliance audits
3. Using Contract Pilots Under Part 91 and Part 135
Contract pilots can be used under both Part 91 and Part 135, but the process differs.
Under Part 91
Operators can:
- Hire contract pilots more flexibly
- Focus on verifying qualifications and currency
- Use contract pilots for short-term or recurring needs
This makes contract pilots a common solution for private flight departments.
Under Part 135
Operators must:
- Ensure pilots meet company training and checking requirements
- Integrate contract pilots into their approved system
- Follow strict documentation and compliance procedures
While more structured, contract pilots are still widely used in Part 135 operations when handled correctly.
4. Insurance Requirements Across Both Operations
Regardless of regulation type, insurance plays a critical role.
Operators must verify:
- Minimum total flight hours
- Required time on aircraft type
- Recent operational experience
Insurance approval is often one of the deciding factors in whether a pilot can be used.
5. Common Challenges for Flight Departments
Operators often face challenges when managing crew requirements across both regulatory frameworks.
These include:
- Understanding differences in compliance expectations
- Managing training requirements for contract pilots
- Ensuring documentation is complete and up to date
- Balancing flexibility with regulatory obligations
Without proper structure, these challenges can lead to delays or compliance risks.
6. How Flight Crew International Supports Both Part 91 and Part 135 Operations
Flight Crew International supports business aviation operators by aligning contract pilot sourcing with both Part 91 and Part 135 requirements.
This includes:
- Verifying licenses, medicals, and type ratings
- Confirming aircraft currency and training status
- Matching pilots to insurance and regulatory requirements
- Supporting structured deployment for Part 135 operations
- Providing flexible solutions for Part 91 operators
This ensures that operators remain compliant while maintaining operational efficiency.
7. How Crewlocator Supports Pilot Availability Across Operations
Finding available pilots quickly is important in both Part 91 and Part 135 environments.
Crewlocator helps operators:
- Identify available pilots based on location
- Improve visibility of crew availability
- Reduce time spent searching for qualified pilots
This supports faster decision-making while compliance and screening are handled through proper channels.
Choosing the Right Approach for Your Operation
Understanding the differences between Part 91 and Part 135 is essential for building a compliant and efficient crew strategy.
Part 91 offers flexibility, while Part 135 provides structured oversight. Both allow the use of contract pilots when handled correctly.
Flight Crew International helps operators navigate both environments by providing compliant, experienced contract pilots tailored to their specific operational needs.
In business aviation, knowing the rules is important. Applying them correctly is what keeps operations running smoothly.
FAQs
Part 91 applies to private, non-commercial operations, while Part 135 applies to commercial charter operations with stricter regulatory requirements.
Yes, contract pilots can be used under both, but Part 135 requires additional training, documentation, and approval processes.
Yes, Part 135 has more structured requirements, including mandatory training programs, check rides, and detailed documentation.
Insurance requirements can vary, but both operations require pilots to meet minimum flight hours and time on type before approval.
Part 135 operations involve commercial activity, which requires stricter oversight, formal procedures, and detailed record-keeping.
Working with an aviation staffing partner helps ensure pilots meet the correct requirements for each type of operation.
Flight Crew International provides experienced and compliant contract pilots for both Part 91 and Part 135 operations.
