Aircraft Partnership: Sharing Ownership with Other Buyers

What is an aircraft partnership?

An aircraft partnership is a co-ownership structure where two to four buyers hold title to a single aircraft, sharing fixed costs and dividing variable costs by hours flown. Unlike fractional programs run by NetJets or Flexjet, a partnership is a private arrangement — the partners select the aircraft, hire the pilots or management company, and govern the asset themselves through an LLC or similar entity.

The economics are straightforward. A King Air 350i with $650,000 in annual fixed costs (hangar, insurance, crew, training, subscriptions) becomes $325,000 per partner in a two-way split, or $216,000 in a three-way. Variable costs — fuel, maintenance reserves, landing fees — get billed to whichever partner flew the leg. Most partnerships settle accounts monthly through the management company.

When does a partnership make financial sense?

A partnership makes sense when each partner flies between 75 and 150 hours annually and the alternative is whole ownership of an underutilized asset. Below 75 hours, a jet card or on-demand charter is cheaper and removes the governance burden. Above 150 hours per partner, scheduling conflicts start eating into the value, and sole ownership becomes defensible.

The break-even math against a jet card sits around 100 hours per partner for midsize jets. A Citation XLS+ jet card at $13,500 per hour costs $1.35M for 100 hours. A two-way partnership on a 2015 XLS+ acquired for $6.5M runs roughly $900,000 all-in per partner at 100 hours each — but the partner also holds half of a depreciating asset worth $3.25M, with residual value to recover at exit.

How do partners split costs?

Fixed costs split by ownership percentage; variable costs split by hours flown. Fixed costs include hangar rent, insurance premiums, crew salaries and benefits, recurrent training, navigation databases, and management fees. These are billed monthly regardless of utilization. Variable costs — fuel, engine and APU reserves (often $400-$900 per hour on a midsize jet), landing and handling fees, catering, crew travel — track to the partner whose flight generated them.

Maintenance reserves deserve special treatment. Smart partnerships fund reserves into a separate account at an hourly rate set by the management company, so a partner who flies 120 hours doesn't get stuck with a $400,000 hot section inspection bill triggered partly by the other partner's 80 hours. Reserve underfunding is the single most common source of partnership disputes.

What goes into the operating agreement?

The operating agreement is the partnership. At minimum it covers scheduling protocol, expense allocation methodology, decisions requiring unanimous versus majority consent, capital call mechanics, restrictions on transfer, and the buy-sell trigger. Have an aviation attorney draft it — not your corporate counsel. Firms like Aerlex, Jetstream Aviation Law, and GKG Law handle this work routinely.

Scheduling is where partnerships break. The cleanest approach is a rolling priority window: each partner can book trips 60 days out on their priority days (typically alternating weeks or assigned days of the week), and conflicts inside that window default to a coin flip or a pre-agreed tiebreaker. Holidays get assigned in the agreement itself — Thanksgiving to Partner A in odd years, Partner B in even years. Vague language here guarantees a fight by year two.

Major decisions — selling the aircraft, refinancing, swapping management companies, approving capital improvements over a threshold (commonly $50,000) — should require unanimous consent. Day-to-day operating decisions go to the management company or a designated managing partner.

How does the buy-sell clause work?

The buy-sell clause forces a clean exit when partners disagree, die, divorce, or simply want out. The standard structure is a "Texas shootout" or "Russian roulette": one partner names a price, and the other must either buy at that price or sell at that price. This forces honest pricing because the offering partner doesn't know which side of the trade they'll end up on.

Alternatives include a right of first refusal (the exiting partner finds a third-party buyer, existing partners can match), or a formula-based buyout using a USPAP-compliant appraisal averaged from two appraisers. Build in a 90-120 day closing window and require the buying partner to refinance any shared debt so the exiting partner is released from personal guarantees.

What are the biggest partnership pitfalls?

The four recurring failures are scheduling conflicts, mismatched utilization, mismatched mission profiles, and underfunded reserves. Mission mismatch is the most insidious: Partner A wants to fly four people to Aspen on weekends; Partner B wants to fly nine people to Europe on Tuesdays. They needed different aircraft, but they bought one together.

Insurance is a hidden trap. Underwriters at Global Aerospace, USAIG, and Starr will rate the policy to the least experienced pilot in the partnership, and a low-time owner-pilot partner can load the premium 50-200%. Disclose pilot qualifications and intended owner-flown operations before signing.

Tax treatment also gets complicated. If the LLC charters the aircraft to non-partners to offset costs, FAA Part 135 certification and FET (7.5% federal excise tax on charter) come into play. If partners reimburse the LLC for personal use, IRS Standard Industry Fare Level (SIFL) rates apply for business-use partners. Get a tax advisor familiar with aircraft — Aviation Tax Consultants, NBAA tax committee members, or a Big Four aviation practice.

How is a partnership different from a fractional?

A partnership gives you ownership of one specific airframe with people you chose; a fractional gives you a share of a managed fleet operated by a program. NetJets, Flexjet, and PlaneSense handle scheduling, crewing, maintenance, and guarantee availability through fleet substitution — you pay for that turnkey structure through monthly management fees and occupied hourly rates that run 20-40% higher than a well-run partnership.

Partnerships win on cost and control. Fractionals win on simplicity, availability, and exit liquidity (the program contractually repurchases the share at fair market value at term end). A partnership has no guaranteed buyer, no backup aircraft when yours is in for a hot section, and no 800 number to call when scheduling breaks down. Know which trade-off you're making before you sign.