Introduction
Part 91 vs Part 135 Crew Requirements: A Practical Guide for Private Aviation Operators
The distinction between Part 91 and Part 135 is not merely regulatory taxonomy. It determines the crew qualification standards applicable to a flight, the training and checking obligations that may apply to an operator, and the compliance exposure that can arise when using contract crew who do not meet the standards required for the specific operation.
Operators who move between Part 91 and Part 135 operations, or manage both simultaneously, need to understand where the requirements diverge and what that means for crew sourcing, documentation, and ongoing compliance. The cost of getting this wrong is not just administrative. It can result in certificate action, enforcement exposure, and significant liability.
For operators sourcing contract crew through CrewBlast understanding these distinctions helps ensure pilots and flight attendants are matched appropriately for the regulatory environment in which they will operate.
The Fundamental Regulatory Difference
Part 91 generally governs non-commercial operations conducted for an owner’s or company’s own purposes, rather than common or on-demand carriage for compensation. This can include corporate flight departments, privately owned aircraft, and certain fractional operations.
Part 135 governs commercial air taxi and on-demand charter operations involving the carriage of persons or property for compensation. Because Part 135 certificate holders operate in a commercial environment involving public trust, the FAA imposes a higher degree of oversight.
The distinction matters for crew because Part 135 imposes structured training requirements, checking requirements, rest and duty limitations, and crew qualification standards that differ materially from Part 91.
Using a pilot qualified for a Part 91 flight does not automatically mean that pilot is qualified to operate under Part 135. Through CrewBlast Connect operators can specify whether they need crew support for Part 91 or Part 135 operations, helping align crew responses with the proper regulatory context.
Medical Certificate Requirements by Operation Type
Under Part 91, pilots acting as pilot in command generally must hold an appropriate and current medical certificate, unless operating under an authorized alternative such as BasicMed where permitted. Many turbine pilots maintain higher-class medical certificates than the minimum required.
Under Part 135, BasicMed is not sufficient. Pilots must hold the medical certificate class and validity required for the operation and privileges exercised, commonly at least a current Second Class medical for Part 135 operations.
For operators using contract pilots on Part 135 trips, verifying medical class and currency should be part of standard vetting. Reviewing qualifications before assignment can prevent avoidable compliance issues, especially when sourcing experienced contract pilots through CrewBlast's Global Network
Training and Checking Requirements Under Part 135
One of the most significant practical differences for operators using contract crew is the Part 135 training and checking structure.
Pilots conducting Part 135 operations must be qualified and checked in accordance with the certificate holder’s approved training program. While prior training may in some cases be credited where permissible, a type rating alone does not make a pilot automatically usable in many Part 135 operations.
This is why experienced Part 135 operators often build an approved contract crew bench in advance, rather than sourcing only when a trip need arises.
Operators can identify and pre-vet candidates through CrewBlast, then run selected pilots through their own qualification process to establish an approved roster before an urgent need arises. Many operators also review prevailing Contract Daily Rates when planning reserve contract crew pools.
Rest and Duty Time Requirements
Part 91 does not impose the same structured duty and rest limitations found under Part 135, though pilots remain responsible for not operating while unfit due to fatigue, and many professional flight departments maintain robust internal fatigue policies.
Part 135, by contrast, imposes duty period limitations, minimum rest requirements, and flight time limitations that must be tracked and complied with.
This is especially important when using contract crew. A contract pilot may arrive available, but prior duty history can still affect legality under Part 135. Confirming recent duty and rest history should be part of every pre-trip compliance review.
That simple conversation can protect both compliance and safety, particularly when using on-demand contract crews sourced through Aircraft Specific Crew Matching
Flight Attendant Requirements Under Part 135
Under Part 135, flight attendant requirements may depend on aircraft certification, passenger seating configuration, and the specific operation.
Where required, flight attendants may need aircraft-specific training and, where applicable, an FAA Certificate of Demonstrated Proficiency. Additional FAA guidance can be reviewed directly through the FAA’s flight attendant certification resources.
Beyond minimum regulatory requirements, many charter operators hold cabin crew to standards that exceed the baseline because service, safety, and repeat client expectations demand it.
Contract flight attendants in the CrewBlast Network include FAA-certificated corporate flight attendants with documented aircraft-specific training. For operators needing to verify qualifications before a Part 135 trip, CrewBlast Connect can support that review.
Building a Compliance-Focused Crew Strategy
For many operators, the distinction between Part 91 and Part 135 is not simply about regulations, it affects how crew are sourced, approved, and retained.
A proactive strategy often includes maintaining a bench of qualified contract pilots and flight attendants, reviewing training currency, monitoring duty and rest compliance, and understanding prevailing Market Daily Rates for Contract Crew
That approach turns crew sourcing from a reactive scramble into operational infrastructure.
The differences between Part 91 and Part 135 are not technicalities. They reflect different regulatory expectations tied to different types of operations.
Operators who understand those differences and build their crew sourcing process around them often find compliance and operational efficiency reinforce one another.
A properly vetted, pre-approved contract crew network that can support Part 135 standards also strengthens Part 91 operations.
That investment is not overhead.
It is the foundation of a crew management system that can be trusted when the operation depends on it.
For operators looking to source qualified Contract Pilots and Contract Flight Attendants for either Part 91 or Part 135 operations, CrewBlast provides access to a global network of vetted crew, while contract crew daily rate resources can help support informed planning.
