A practical guide to co-owning an aircraft — structuring the partnership, drafting an ownership agreement, handling costs, scheduling, and what to do when partners disagree.
Aircraft co-ownership is one of the most underrated paths to affordable flying. Two or three pilots sharing a well-maintained aircraft can each access it for less than half the cost of individual ownership, while spreading the fixed costs that make personal ownership prohibitive for many pilots.
Co-ownership partnerships do break down, and the common causes are consistent: disputes over unequal flying frequency, maintenance disagreements, and exit friction when one partner wants to sell. Most of these trace back to partnership agreements that didn't cover these scenarios in sufficient detail at the outset.
This guide covers how to structure the arrangement and what the written agreement should include before the purchase closes.
For a Cessna 172 in most US markets, annual fixed costs (insurance, hangar, annual inspection, engine reserve) run $8,000–$14,000 before you add a dollar of fuel. If you fly 100 hours per year, that's $80–$140/hr in fixed costs alone — similar to club rental rates, but you get your own aircraft with no scheduling competition.
With a co-owner splitting those fixed costs equally, and both partners flying ~100 hours annually, each partner's fixed cost drops to $40–$70/hr. Add fuel and variable maintenance and you're typically in the $80–$130/hr range depending on the aircraft, with the benefits of ownership: your schedule, your standards, your configuration.
The math works best when:
The partnership decision is more consequential than the aircraft decision. A mediocre aircraft with a great partner works fine; a great aircraft with a problematic partner is a year of disputes waiting to happen.
Questions to discuss before committing:
Flying frequency: How many hours does each of you fly per year? A 300-hour pilot paired with a 50-hour pilot will resent the scheduling asymmetry even if costs are split equally.
Flying habits: Day VFR local flights vs. frequent multi-day cross-countries have very different scheduling implications. One partner taking the aircraft for 10 days at a time is workable with the right agreement, but becomes a point of friction without one.
Maintenance philosophy: "Fly it until it breaks" vs. "fix everything at first sign" creates real disagreements. Know your partner's tolerance for deferred maintenance before you share an aircraft.
Equipment expectations: Do you both want glass avionics? Or will one partner resent paying for an upgrade the other doesn't value? Major upgrades should require consensus.
Financial stability: Can both partners reliably pay their share of unexpected costs? A $6,000 unexpected engine repair hitting when one partner is financially stretched creates pressure on the relationship.
The simplest structure: both names on the aircraft registration as co-owners. This works but provides no liability separation — if the aircraft is involved in an incident, both partners are personally exposed.
For a two-person partnership where both fly the aircraft, this is common and acceptable if you have adequate hull and liability insurance.
An LLC holding the aircraft provides:
The LLC costs ~$50–$200/year in state fees depending on your state. For aircraft valued over $100,000 or partnerships with more than two partners, the structure is worth it.
Whether or not you form an LLC, your partnership needs a written agreement. This is the document that prevents disputes — or, when disputes arise, resolves them without lawyers.
Fixed costs (insurance, hangar, annual inspection, reserves) are typically split equally regardless of how much each partner flies. This is the most common model.
Variable costs (fuel, oil, maintenance triggered by specific flights) can be split proportionally to Hobbs hours flown. This requires tracking who flew how many hours each month.
Engine reserve: Agree on a per-hour engine reserve (typically $15–$25/hr for a Lycoming or Continental) and how it's accounted — per partner based on their Hobbs hours, or pooled in a shared reserve account.
Example structure:
Fixed monthly per partner: $550 (insurance + hangar + inspection reserve)
Engine reserve: $20/Hobbs hour per partner
Fuel: Each partner fuels when they take the aircraft
Oil: From pooled supply at the hangar; log usage
Advance booking: How far in advance can a partner claim the aircraft? 14 days? 30 days? Establish a maximum that prevents one partner from locking the aircraft indefinitely.
Extended trips: Trips longer than 3–5 days should require advance notice and agreement if they conflict with the other partner's plans.
Home base priority: If both partners want the aircraft on the same day, what's the tie-breaker? First to book? Rotate priority? Establish this in writing.
Blocked periods: Some partnerships allow each partner to "claim" a certain number of exclusive weeks per year for vacation trips. Define this.
Routine maintenance (oil changes, tire replacements, small squawks): One partner is designated as the maintenance lead; they can authorize expenses up to a threshold (e.g., $500) without requiring the other's approval.
Major repairs and upgrades: Any expense above the threshold requires mutual agreement. Define "mutual agreement" — does it mean both must approve, or majority (for 3+ partners)?
What happens when partners disagree on a maintenance item? A deadlock provision — e.g., an independent IA reviews and recommends, and both partners are bound by the recommendation — prevents disputes from grounding the aircraft indefinitely.
This is the most important section and the most frequently omitted. What happens when a partner wants out?
Right of first refusal: The exiting partner must first offer their share to the remaining partners at the agreed price before selling to a third party.
Valuation: How is the aircraft valued for buyout purposes? Blue Book? An independent appraisal? Agree on the method upfront, not when you're in the middle of a dispute.
Timeline: The remaining partner(s) should have 30–60 days to exercise the right of first refusal.
Death or incapacity: If a partner dies, what happens to their share? Does it pass to their estate or to the surviving partners? This is especially important if the surviving partner would end up co-owning an aircraft with a stranger.
Force sale: If partners cannot agree on an exit (e.g., one wants to sell, the other doesn't), how is it resolved? A common provision: either partner can trigger a forced sale process by giving 90 days' notice; the aircraft is then listed at a mutually agreed price with a deadline, after which it's sold at whatever the market will bear.
Both partners should be named insureds on the policy. Key items to verify:
Review the policy annually. If one partner acquires a new rating or the aircraft is modified, notify the insurer.
A co-ownership without tracking systems degrades into disputes about who owes what. At minimum, you need:
Aloft360's ownership features were built for exactly this: per-owner flight hour tracking, shared maintenance records, and scheduling from a single shared calendar. It turns the administrative overhead of co-ownership into a 5-minute monthly reconciliation.
The most common co-ownership failures:
Asymmetric flying: One partner stops flying (new baby, job change, health issue) but remains responsible for half the fixed costs. Agree upfront on what happens — suspended membership? Reduced cost share? The right to exit on short notice if not flying?
Maintenance disagreements: One partner wants to fly behind a marginal squawk; the other wants it fixed immediately. Your agreement should designate a decision-maker for airworthiness calls and specify that the conservative recommendation controls.
Upgrade disagreements: One partner wants ADS-B+ and a new GNS 430; the other is happy with round dials. Upgrades should require mutual agreement and a cost-sharing formula.
Skipping the written agreement: Partnerships between friends sometimes skip formal documentation because it feels unnecessary. A written agreement protects the partnership by establishing how decisions are made before disagreements arise, not after.
For more on managing aircraft ownership, see our overview of aircraft ownership management with Aloft360 and our guide on how to start a flying club if you're considering a larger group structure.