A shared-use agreement lets a private flight department's aircraft fly charter under a certificated operator's Air Operator Certificate (AOC) without either party losing control of their own certificate. Private Aviation Technology Ltd. (PATL) structures these agreements around one non-negotiable principle: operational control must be traceable, flight by flight, to a single party at all times. Get that wrong and a flight department risks illegal charter exposure; get it right and an owner turns idle aircraft hours into revenue while the charter operator gains fleet capacity without buying metal.
TL;DR
- Shared-use agreements work only when operational control transfers cleanly between the flight department and the charter operator on a flight-by-flight basis, not as a blended or ambiguous arrangement [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001).
- Regulators (ICAO, EASA, FAA) do not offer a single joint approval path for these arrangements; compliance is built through dry lease structuring and documentation, not a regulatory checkbox [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001).
- Crew duty and flight time accrue across both operations, and crews must meet the stricter of the two certificate holders' training and rest standards when flying charter [[crewblast.co]](https://www.crewblast.co/blog/aviation-crew-compliance-what-private-jet-operators-must-know-in-2026).
- Insurance thresholds for shared-use corporate aircraft typically run far above the regulatory minimum, often into the tens or hundreds of millions in combined single limit coverage.
- Third-party audit frameworks such as IS-BAO give both parties a documented, verifiable record that the arrangement is real and not a disguised wet lease.
About the Author
PATL's compliance work is led by practitioners who have sat on both sides of this problem: Ray Wilson, an IS-BAO Stage 3 auditor with 15 years across military, commercial, and business aviation and multi-registry AOC compliance expertise, structures shared-use frameworks for flight departments and charter operators across Asia. PATL's engagements are independent and strictly confidential, and its costing and operations design work is what makes shared-use economics reconcile in practice rather than just on paper.
What Is a Shared-Use Agreement in Private Aviation?
A shared-use agreement is a contract that allows an aircraft owned or operated by a private flight department to fly commercial charter under a separate operator's AOC, while the flight department retains the aircraft for its own non-commercial use the rest of the time. The mechanism underneath almost every shared-use deal is a dry lease: the flight department (as lessor) leases the bare aircraft to the charter operator (as lessee) for defined periods, and the charter operator supplies its own crew and retains full operational control during those periods [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001).
The reverse is also true. When the flight department flies the aircraft for its own purposes, operational control reverts to the owner or lessee under the original non-commercial arrangement [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001). This back-and-forth is the entire point of the structure, and it is also exactly where things go wrong if the paperwork does not match the reality of who is actually making operational decisions on a given flight.
Think of it like a rental car company that occasionally lets an owner-driver take the car back for personal errands. The insurance, the driving record, and the liability all have to switch cleanly to whoever is behind the wheel that day. A shared-use agreement is that switch, formalized for an asset that is regulated far more heavily than a car.
Why Does Operational Control Matter More Than Ownership?
Operational control, not ownership, is the variable regulators actually care about. ICAO, EASA, and the FAA each require that whoever holds the commercial certificate for a given flight retain full operational control of that flight, meaning they decide on crewing, dispatch, maintenance status, and go/no-go authority [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001). There is no joint regulatory approval process that blesses a shared-use agreement as a package; instead, each authority evaluates whether operational control was genuinely transferred through the underlying dry lease and, in the U.S. context, through FAA Truth in Leasing compliance [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001).
This is the point where PATL's operations design work becomes load-bearing rather than administrative. A shared-use agreement is not one document, it is a set of operating procedures that have to produce a clean, auditable answer to "who was in control of this specific flight" for every flight flown. NBAA's best-practice guidance is explicit that lessees must provide their own crew independently of the lessor and must avoid "sham" dry leases that function as illegal wet leases in substance [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001). A sham lease typically shows up as the lessor's crew still flying the aircraft, or the lessor retaining scheduling authority, while the paperwork claims the lessee is in control.
How Do Crew Duty and Qualification Rules Apply Across Both Operations?
Crew time does not reset when an aircraft switches between flight department and charter use. Both EASA and the FAA require that all flying, including non-commercial flight department legs, be logged and counted toward the crew's cumulative commercial flight and duty time limitations [[crewblast.co]](https://www.crewblast.co/blog/aviation-crew-compliance-what-private-jet-operators-must-know-in-2026). That means a pilot cannot fly a full duty day for the flight department and then be treated as fresh for a charter leg later that day; the hours stack.
Crews transitioning into charter operations under the shared-use structure must also meet the stricter of the two operations' qualification, training, and rest requirements, meaning the charter certificate holder's standards typically govern regardless of which entity the pilot's primary employer is [[crewblast.co]](https://www.crewblast.co/blog/aviation-crew-compliance-what-private-jet-operators-must-know-in-2026). Building on the operational control question above, this is why PATL treats crew scheduling as a compliance document, not just a rostering tool: a duty-time miscalculation across the two operations is one of the more common ways a shared-use agreement gets flagged in audit, and it is entirely preventable with the right tracking workflow.
What Insurance and Liability Structure Does a Shared-Use Agreement Need?
Insurance in a shared-use agreement has to cover two different operating profiles under one aircraft. The regulatory floor for commercial charter liability coverage, set by DOT Part 205, is $300,000 per passenger, but that figure is a minimum, not an operating standard. Industry practice for shared-use corporate aircraft typically requires combined single limit liability coverage in the range of $50 million to $300 million, along with full physical damage hull coverage.
The reason the practical number sits so far above the regulatory floor is straightforward: charter passengers, hull replacement cost, and third-party liability exposure on a business jet scale differently than the per-passenger minimum was designed around. A shared-use agreement has to specify, in writing, which party's policy is primary during which type of flight, and that allocation needs to match the operational control transfer described above. Insurance that does not track the operational control split is a liability gap waiting to surface at the worst possible moment, typically after an incident rather than before one.
How Do Audit Frameworks Verify a Shared-Use Arrangement Is Legitimate?
Third-party audit frameworks give both parties documented proof that the shared-use arrangement functions as claimed rather than as a paper exercise. Voluntary frameworks including ARGUS, Wyvern, and IS-BAO verify compliance for mixed-use operations by examining pilot training records, maintenance documentation, and Safety Management System evidence across both the private flight department side and the commercial charter side [[crewblast.co]](https://www.crewblast.co/blog/aviation-crew-compliance-what-private-jet-operators-must-know-in-2026). These audits confirm that current, compliant documentation exists for both operating profiles, not just the one that happens to be running on the day of an inspection.
This is where PATL's audit-readiness work sits. Ray Wilson's IS-BAO Stage 3 auditor credential means the documentation PATL builds for a shared-use client is structured to withstand exactly this kind of external review, not retrofitted after an audit notice arrives. A related but distinct question is maintenance: EASA CS-23 and FAA Part 23 govern aircraft design certification and require manufacturers to supply Instructions for Continued Airworthiness, but they do not impose operational maintenance documentation rules for mixed-use flying. That tracking responsibility falls instead to operational rules like EASA Part-M or FAA Part 43 and Part 135, meaning the flight department and the charter operator each need airworthiness records that reconcile with the other's, not two disconnected logbooks.
How Should Flight Departments and Charter Operators Structure the Handoff?
The handoff between non-commercial and commercial use should be defined at the level of a single flight, not a block of time. A shared-use agreement built around monthly or seasonal blocks of "charter time" versus "owner time" tends to blur exactly the operational control distinction regulators are checking for. The cleaner model, and the one consistent with NBAA's dry lease guidance, treats every flight as its own event with its own operational control determination, its own crew assignment logged against the correct duty time bucket, and its own maintenance sign-off under the applicable Part-M or Part 135 requirement [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001)[[crewblast.co]](https://www.crewblast.co/blog/aviation-crew-compliance-what-private-jet-operators-must-know-in-2026).
In practice this requires three things working together: a costing model that correctly allocates shared costs (fuel, crew, maintenance reserves) between the two operating profiles so quotes reconcile to actuals; an operations workflow that timestamps and documents each control transfer; and a compliance calendar that keeps crew qualifications current to the stricter of the two standards. PATL's work with flight departments and operators across Asia, and the operator relationships inherited from L'VOYAGE's private aviation activity in Hong Kong since 2014, means this structuring work is grounded in how these handoffs actually play out on the ramp, not just in the regulatory text.
Frequently Asked Questions
Is a shared-use agreement the same as a dry lease? No. A dry lease is the legal mechanism most shared-use agreements are built on, but the shared-use agreement is the broader commercial arrangement governing when and how the aircraft moves between non-commercial and charter use [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001).
Can a flight department's pilots fly the aircraft under the charter operator's AOC? Typically not directly. NBAA best practice requires the charter operator (lessee) to supply its own crew independently of the lessor to avoid the arrangement being treated as an illegal wet lease [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001).
Do flight department hours count against a pilot's charter duty limits? Yes. Both EASA and FAA rules require all flying, non-commercial included, to be logged and counted toward cumulative flight and duty time limitations [[crewblast.co]](https://www.crewblast.co/blog/aviation-crew-compliance-what-private-jet-operators-must-know-in-2026).
What insurance coverage should a shared-use aircraft carry? Regulatory minimums like the DOT Part 205 $300,000 per passenger requirement are a floor. Industry practice for shared-use corporate aircraft commonly runs $50 million to $300 million in combined single limit coverage plus hull coverage.
Does IS-BAO certification cover both the private and charter sides of a shared-use operation? An IS-BAO audit examines pilot training, maintenance records, and Safety Management System documentation across the operation being audited, and can be scoped to verify both operating profiles maintain current, compliant documentation [[crewblast.co]](https://www.crewblast.co/blog/aviation-crew-compliance-what-private-jet-operators-must-know-in-2026).
Who is liable if operational control is unclear during an incident? Liability follows whoever regulators determine held operational control at the time of the flight, which is why the agreement must define control transfer on a flight-by-flight basis rather than a block-time basis [[drs.faa.gov]](https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01047-00000000000.0001).
Can PATL help structure a shared-use agreement between two unrelated companies? Yes. PATL's operations design and compliance consulting work covers exactly this kind of multi-party arrangement, and all engagements are handled on an independent, strictly confidential basis.
About Private Aviation Technology Ltd.
Private Aviation Technology Ltd. (PATL) is an independent consulting firm built around the hard technical and regulatory problems of private aviation: costing architecture, operations design, AOC compliance support, and IS-BAO / IS-BAH audit preparation. The firm is the sister company of L'VOYAGE, a Hong Kong-based private aviation consultancy founded in 2014, which gives PATL access to over a decade of operator relationships and regulatory familiarity across Asia. PATL's team combines Ray Wilson's IS-BAO Stage 3 auditor credential and multi-registry AOC compliance expertise, Jolie Howard's experience as a former CEO in the Asia private aviation sector, and Bernard Lee's enterprise systems and data integration background, a combination that lets PATL turn arrangements like shared-use agreements into documented, audit-ready operating models rather than one-off legal paperwork.
If your flight department or charter operation is structuring a shared-use agreement and needs the operational control transfer, crew duty tracking, insurance allocation, or audit documentation built correctly from the outset, get in touch with PATL at https://www.privateaviationtech.com/.
References
- Dynamic Regulatory System (drs.faa.gov)
- Aviation Crew Compliance: What Private Jet Operators Must Know in 2026 (crewblast.co)