Part 135 Certificate: Adding Your Aircraft to a Charter Operation

What does it mean to put an aircraft on a Part 135 certificate?

Putting an aircraft on a Part 135 certificate means listing it on a certificated charter operator's FAA operations specifications so the operator can legally sell seats or whole-aircraft charter flights on it. The aircraft remains owned by the owner — title doesn't change — but operational control during charter flights shifts to the certificate holder, who is responsible for the flight under FAA rules.

This is the mechanism that lets an owner generate revenue from an aircraft that would otherwise sit on the ramp 80% of the time. Without a 135 certificate, the owner can fly the aircraft personally under Part 91 but cannot accept compensation from third parties for transportation. The certificate holder — either a national operator like Jet Aviation, Clay Lacy, Solairus, or Executive Jet Management, or a regional Part 135 operator — handles the regulatory burden in exchange for a cut of the revenue.

What is a conformity inspection and how long does it take?

A conformity inspection is the FAA-witnessed process of verifying that the aircraft, its maintenance records, and its equipment all meet the requirements of the operator's Part 135 OpSpecs. Most aircraft take four to eight weeks from contract signing to first revenue flight, though it can stretch to twelve weeks if discrepancies surface.

The operator's director of maintenance audits every logbook entry back to manufacture, verifies AD and SB compliance, confirms the aircraft is equipped to the operator's MEL, and checks that required 135 equipment — CVR, FDR where applicable, TAWS, second altimeter on some categories — is installed and operational. Anything missing gets installed at the owner's expense before the aircraft enters service. Budget $15K-$75K for typical conformity squawks on a midsize jet that's been flown Part 91 only; older aircraft or those with sloppy records can hit six figures.

How does the charter revenue split actually work?

The standard owner-favored split is 85/15, with 80/20 and 90/10 as the realistic outer bounds depending on aircraft category, market demand, and the operator's fleet leverage. The split applies to net revenue, which is the charter hourly rate multiplied by flight time, minus the 7.5% federal excise tax, minus broker commissions (typically 5-10%), minus repositioning fuel if billed separately.

On a midsize jet chartering at $7,500/hour wholesale, a 10-hour trip generates roughly $75,000 gross. After 7.5% FET ($5,200) and a 7% broker commission ($4,900), net revenue is about $65,000. At an 85/15 split the owner sees roughly $55,000, but direct operating costs — fuel, engine reserves, crew per diem, landing fees — eat $25,000-$35,000 of that. The owner nets $20,000-$30,000 on the trip, which is real money but well short of the all-in cost of the flight hour.

This is why charter revenue offsets fixed costs rather than producing profit. The honest math: most managed charter programs return 30-60% of annual fixed costs to the owner, with light jets at the low end and popular heavy aircraft on dense routes at the high end.

What changes operationally when the aircraft is on a 135 certificate?

Part 135 imposes stricter maintenance, pilot, and dispatch standards than Part 91, and these rules apply to every flight the aircraft makes — including owner flights, unless the owner specifically requests a Part 91 leg. Maintenance intervals are tighter, MEL deferrals are more restrictive, and any out-of-service item requires operator dispatch approval before the next flight.

Pilots flying the aircraft on charter must meet 135 currency requirements: 135.293 and 135.297 checkrides every six and twelve months respectively, plus line checks. Most managed aircraft carry dedicated crews — captain $150K-$400K and first officer $100K-$250K depending on aircraft category, plus benefits, recurrent training at FlightSafety or CAE, and per diem. These costs sit inside the monthly management fee structure rather than being billed per flight.

The owner also loses some scheduling flexibility. Once a charter trip is booked, the owner can't bump it without paying cancellation penalties to the charter customer, typically 50-100% of the trip value depending on notice. Most agreements give the owner first-call rights with 24-72 hours notice; tighter than that and the charter trip wins.

What should owners watch for in the 135 addition agreement?

The agreement language that matters most: the revenue split formula, what gets deducted before the split, parts and fuel markup caps, charter rate floor, owner blackout rights, and termination terms. Each of these is where the economics actually live.

Parts and fuel markup is the line item that quietly moves real money. Standard markup runs 5-15% on parts and 5-10% on fuel, but some operators run higher and bury it in line-item invoicing. Negotiate a cap in writing — 10% on parts, 7% on fuel is reasonable on a single-aircraft agreement, lower on fleet pricing. Demand audit rights at owner expense, exercisable annually with 30 days notice.

The charter rate floor protects the owner from the operator dumping the aircraft at low rates to fill empty legs. A floor of 90-95% of published wholesale rate, with empty-leg exceptions defined in writing, is standard. Without a floor, the operator can move volume that benefits the operator's utilization metrics while underpaying the owner per hour.

Term length is typically three to five years with a 90-day termination notice provision. Shorter terms favor the owner; the operator wants longer to amortize crew training and onboarding cost. If you sign a five-year deal, get a two-year owner termination right with cause defined broadly — declining charter revenue, maintenance dispute, change of operator ownership.

Is putting an aircraft on a 135 certificate worth it?

For owners flying fewer than 150-200 hours annually on an aircraft that generates outside charter demand, yes — the revenue offset is real and the operational discipline of 135 maintenance often improves residual value at sale. For owners flying 300+ hours annually who want full schedule control, no — the charter revenue won't offset the friction, and Part 91 management without a 135 layer is cleaner.

The break-even is roughly 200 charter hours per year on a midsize or heavy jet. Below that, the management premium for being on a 135 certificate — typically $2K-$5K/month above pure Part 91 management — isn't recovered. Above it, the math works, with the caveat that no managed charter program profits on a tax-adjusted basis once depreciation recapture and the cost of capital are honestly accounted for.