A friend calls with an urgent favor. They need to get to a city two hours away — for a business meeting, a hospital visit, or a wedding — and you have a fueled airplane and a free afternoon. You agree to take them for “free.” To you, it’s a generous gesture. To the FAA, it may be an illegal Part 135 charter operation that puts your pilot certificate at immediate risk.
This isn’t a theoretical concern. The FAA and AOPA recently produced a video series titled “Protecting Your Certificate — Keeping it Safe and Legal,” featuring Don Riley of the FAA’s Special Emphasis Investigations Team and Ian Arendt of the AOPA Legal Services Plan, specifically because pilots are losing certificates over flights they thought were perfectly legal favors. Here’s what every private and commercial pilot needs to understand about cost-sharing under 14 CFR 61.113(c) — and the four traps that catch pilots most often.
What Does FAR 61.113(c) Actually Allow?
Federal Aviation Regulation 61.113(c) is the narrow legal exception that lets private pilots share certain flight costs with their passengers without crossing into commercial-operation territory. Under the rule, a private pilot may share the operating expenses of a flight with passengers — but only if two conditions are met:
- The pilot and passengers must have a bona fide common purpose for the flight, and
- The pilot must pay at least their pro rata share of the limited categories of expenses the regulation permits.
That’s the entire safe harbor. Everything outside those two conditions risks reclassification as a commercial operation requiring a Part 135 Air Carrier Certificate — something no individual pilot holds on their own.
The FAA’s authoritative guidance on this is Advisory Circular 61-142, available at faa.gov. As Don Riley emphasized in the FAA/AOPA video series, the purpose of these rules isn’t to be pedantic. It’s to ensure that “passengers in the back of the airplane” are protected by the higher safety standards of Part 135 whenever they pay for air transportation.
Trap #1: “Compensation” Is a Legal Dragnet
The first and biggest misconception is that “no money changed hands” means there’s no compensation. The FAA and the NTSB have defined compensation broadly enough to catch almost any benefit a pilot receives in connection with a flight.
According to the legal standard cited in the FAA/AOPA video series:
“Compensation is a receipt of anything of value that’s conditioned on a pilot flying an aircraft.”
A profit motive is not required. As Ian Arendt of the AOPA Legal Services Plan explained, the NTSB has consistently supported this broad definition through case law. The forms of compensation that count include:
Direct monetary payment. Cash, electronic transfer, or any payment that covers flight costs or generates profit.
Building flight time. This is the most dangerous trap for junior pilots. Logging hours toward a 1,500-hour ATP milestone is a significant “thing of value.” If you wouldn’t have flown that mission except for the opportunity to log time while a passenger shared the costs, the FAA views the flight time itself as compensation.
Goodwill. Favorable reputation, future business leads, or relationship value gained by providing the flight all count as compensation.
Secondary benefits. Meals, event tickets, gifts, or any other benefit conditioned on the flight constitutes compensation. The benefit doesn’t need to be substantial. A passenger buying the pilot dinner as a “thank you” can be enough to invalidate a cost-sharing arrangement.
The legal risk lies in the mismatch between pilot intent and FAA interpretation. A pilot may sincerely believe they’re “just helping a friend.” The FAA cares about the objective value received — not the pilot’s subjective intent.
Trap #2: Common Destination Is Not Common Purpose
The second trap is misunderstanding the difference between flying to the same destination and having a bona fide common purpose for being there.
To satisfy the common purpose test, the pilot must have an independent, pre-existing reason for traveling to the destination — a reason that exists separately from the passenger’s needs. The legal pivot is who chose the destination.
Example that fails the test (Medical Emergency): A friend asks you to fly their family member to a hospital in another city. You have no other reason to be in that city. Even if you refuse all payment and cover every cost yourself, this flight fails the common purpose test. The destination was chosen by the passenger. You’re effectively functioning as an on-demand air taxi.
Example that passes the test (The Beach): You planned to fly to the beach for your own recreation. A friend asks to join. You both have a legitimate, independent reason to be at the destination — yours for recreation, theirs to come along. The flight would have happened regardless.
Example that passes the test (FBO Mechanic): You scheduled a maintenance inspection with a renowned mechanic at an FBO 200 miles away. A friend asks to ride along to attend a baseball game in the same city. You have a pre-existing, scheduled reason to make the flight. Common purpose is satisfied.
The simple test: Ask yourself, “Would I have flown to this destination if the passenger wasn’t going?” If the answer is no, you lack a common purpose — and the flight may be an illegal charter regardless of whether anyone paid you anything.
Trap #3: The Pro Rata Rule and the “Dinner Trap”
Even when common purpose is established, the financial mechanics of cost-sharing are strictly limited. Under 14 CFR 61.113(c), the only expenses you can share with passengers are four specific categories:
- Fuel
- Oil
- Airport expenditures (landing fees, tie-down fees)
- Aircraft rental fees
That’s it. Nothing else.
The pilot must pay at least their pro rata share — a mathematical floor based on the number of people on board. If four people are flying, the pilot must pay at least 25 percent of those four categories of expenses. The pilot cannot be subsidized below that share.
This creates what the FAA/AOPA video calls “The Dinner Trap.” If a grateful passenger buys you a $20 steak as a thank-you after a flight, that meal is “anything of value” conditioned on the flight. Because dinner isn’t one of the four approved expenses, it constitutes compensation outside the cost-sharing safe harbor — potentially invalidating the entire arrangement and exposing the pilot to enforcement.
There’s also an “unwritten rule” that AC 61-142 clarifies: the money for the passenger’s share must come directly from the passengers themselves. If a passenger’s employer pays for the flight — even if the passenger benefits — the operation is no longer a private cost-sharing arrangement. It’s a commercial flight funded by a third party, which requires a Part 135 certificate.
Trap #4: A Commercial Certificate Is Not a License to Haul
Many commercial pilots assume that earning the commercial certificate gives them the legal authority to fly people for hire on their own. This is a fundamental misunderstanding of the difference between certification under Part 61 and operational rules under Part 135.
A commercial pilot certificate certifies that you have the skills, experience, and knowledge required to fly professionally. It’s a credential — essentially a license to learn to be a professional pilot, or to fly for a company that holds an operating certificate.
A commercial certificate does not, by itself, give you the right to advertise transportation services, accept payment from the public to carry passengers, or operate as a one-person air carrier.
If you carry passengers for compensation or hire without operating under a Part 135 Air Carrier Certificate, you are violating federal law — regardless of how many pilot certificates you hold. As a commercial pilot operating without an air carrier certificate, you’re bound by the same cost-sharing and common purpose rules as a private pilot.
This catches more commercial pilots than people realize. Posting on social media that you’ll fly people to events, accepting “donations” for transportation, or quietly running an informal charter business out of your owned aircraft can all trigger FAA enforcement actions even with a commercial certificate in your wallet.
How to Stay Inside the Guardrails
The path to legal cost-sharing is narrow, but it’s clear:
Read AC 61-142. This Advisory Circular is the FAA’s definitive guide to cost-sharing rules. Study it the way you’d study a sectional chart. Available at faa.gov.
Apply the common purpose test honestly. Before every flight with a passenger, ask: “Would I have flown to this destination if my passenger wasn’t going?” If the answer is no, don’t fly the mission as a private cost-sharing flight.
Stick to the four expense categories. Fuel, oil, airport fees, and rental. Anything else — meals, hotels, ground transportation, gifts — falls outside the safe harbor.
Pay at least your pro rata share. Calculate it explicitly. If four people are on board, you pay at least 25 percent of the four allowed categories. Document it.
Decline thank-you favors that condition on the flight. If a passenger offers to buy you dinner because you flew them somewhere, the polite legal answer is: “Thanks, but I’ll get my own.” It sounds extreme. It’s also the difference between a clean record and a Letter of Investigation.
Consider the AOPA Legal Services Plan. At approximately $33 per year for most pilots, it provides legal counsel if the FAA opens an enforcement action. Many cost-sharing violations are inadvertent. Having a lawyer on call can make the difference between a warning letter and a certificate revocation.
The Bottom Line
The FAA isn’t trying to stop you from flying with friends. The rules exist to protect the people in the back of the airplane — the same protection that drives every Part 135 regulation about maintenance, training, and operational oversight. Cost-sharing is a narrow exception, not a loophole.
The next time a friend calls with a favor, ask yourself the question that defines the entire legal framework: “Am I the pilot here, or am I an unlicensed airline?”
If you can’t answer that with confidence, the right answer is to say no — or to study AC 61-142 before you say yes.
Frequently Asked Questions
What is FAR 61.113(c)? FAR 61.113(c) is the federal aviation regulation that allows private pilots to share certain flight expenses with passengers without crossing into commercial operations. It permits sharing of fuel, oil, airport expenditures, and aircraft rental fees only — and only when the pilot pays at least their pro rata share and the flight has a bona fide common purpose.
What counts as “compensation” under FAA rules? The FAA defines compensation as “anything of value conditioned on a pilot flying an aircraft.” This includes direct cash payments, building flight time toward a higher certificate, generating goodwill or business leads, and secondary benefits like meals, event tickets, or gifts. A profit motive is not required for a violation.
What is the common purpose test for cost-sharing? The common purpose test requires the pilot to have an independent, pre-existing reason to travel to the destination — separate from the passenger’s needs. If the pilot only flew the mission because the passenger asked, the flight fails the test and may be classified as an illegal commercial charter. The key question: “Would I have flown to this destination if the passenger wasn’t going?”
What expenses can a private pilot share with passengers? Under 14 CFR 61.113(c), only four expense categories can be shared: fuel, oil, airport expenditures (such as landing and tie-down fees), and aircraft rental fees. Meals, ground transportation, hotels, and other expenses are not permitted to be shared as part of a cost-sharing arrangement.
Does a commercial pilot certificate allow me to fly people for hire? No. A commercial pilot certificate is a credential certifying your skills to fly professionally — but it does not, by itself, authorize you to carry passengers for compensation or hire. Carrying passengers for hire requires operating under a Part 135 Air Carrier Certificate. Without one, a commercial pilot is bound by the same cost-sharing and common purpose rules as a private pilot.
Sources:
- FAA & AOPA Air Safety Institute — Cost Sharing Your Aircraft: Protecting Your Pilot Certificate (YouTube)
- FAA — Advisory Circular 61-142: Sharing Aircraft Operating Expenses in Accordance with 14 CFR 61.113(c)
- FAA — 14 CFR 61.113: Private Pilot Privileges and Limitations
- AOPA Pilot Protection Services — Legal Services Plan
- AOPA Air Safety Institute — Protecting Your Certificate Video Series
