Aircraft hull deductibles split into in-motion (typically 1-5% of hull value) and not-in-motion (typically $5K-$25K flat). Raising the in-motion deductible from 2% to 5% generally cuts hull premium 15-25%, but only makes sense when the owner can self-fund a six-figure retention and the aircraft sees low annual utilization.
How are aircraft hull deductibles structured?
Aircraft hull policies carry two deductibles: in-motion and not-in-motion. In-motion applies any time the aircraft is moving under its own power or being towed — taxi, takeoff, flight, landing, ground handling. Not-in-motion applies to losses sustained while parked, hangared, or tied down. The two figures are almost never equal, and underwriters at USAIG, Global Aerospace, AIG, Starr, and Berkshire Hathaway Specialty quote them as separate line items.
In-motion deductibles on turbine aircraft are expressed as a percentage of insured hull value, typically 1% to 5%. On a $15 million super-midsize jet, a 2% in-motion deductible is $300,000 out of pocket before the carrier pays a dollar. Not-in-motion deductibles are flat dollar figures, usually $5,000 to $25,000, and on many owner-flown turboprop and piston policies the not-in-motion deductible is zero.
Part 91 owner-operators see lower in-motion percentages than Part 135 charter operators on the same airframe. A privately flown Citation Latitude might carry a 1% in-motion deductible; the same tail on a 135 certificate often carries 2% or 2.5% because the utilization and crew rotation profile is riskier.
When does raising the deductible actually save money?
Raising the in-motion deductible saves meaningful premium only when the spread between deductible tiers is wide enough to matter and the owner has the balance sheet to absorb the retention. Moving from a 2% to a 5% in-motion deductible on a midsize jet typically cuts hull premium 15% to 25%. On a $1.2 million hull premium for a $20 million Challenger 350, that is $180,000 to $300,000 in annual savings against a $600,000 increased retention.
The math works when annual flight hours are low (under 200), the aircraft is hangared at a tower-controlled field, and the pilot roster is stable with high time-in-type. The math fails on high-utilization aircraft, Part 135 fleet aircraft, and owners who cannot write a $500,000+ check without disrupting operations.
A more useful lever for many owners is the not-in-motion deductible. Pushing not-in-motion from $10,000 to $25,000 might only save 2% to 4% of premium and is rarely worth the exposure given how often hangar rash, ground vehicle strikes, and weather events drive smaller claims.
What deductible does the underwriter actually want?
Underwriters generally want the deductible high enough that the insured has skin in the game but not so high that small losses go unreported and compound into larger problems. Most carriers cap the in-motion deductible they will offer at 5% of hull value on turbine aircraft, and several will not quote above 3% on aircraft over $25 million in hull value because the absolute dollar retention starts to exceed what they consider prudent for a single insured.
For first-time jet owners with under 500 hours total time or no time in type, underwriters frequently mandate a higher deductible — often 2.5% to 5% in-motion — for the first 12 months, then drop it at renewal after the pilot completes the required 25-50 mentor hours and a FlightSafety or CAE initial. This is a contractual requirement, not a negotiable strategy.
Owner-flown aircraft with a single-pilot waiver carry higher deductibles than two-crew operations on the same airframe. A single-pilot Phenom 300 operation will see in-motion deductibles 50 to 100 basis points higher than the same aircraft with a SIC requirement.
How do disappearing deductibles and aggregate caps work?
Disappearing deductibles erode based on loss size or claim-free renewals. The common structure: the in-motion deductible reduces by 25% per consecutive claim-free year, capped at a 50% reduction after two clean years. Some carriers offer a full waiver of the not-in-motion deductible after three claim-free renewals. These features are standard on owner-flown turboprop and light jet quotes from USAIG and Global Aerospace but are rarely offered on heavy iron or Part 135 risks.
Aggregate deductible caps matter for fleet operators. Without a cap, a Part 135 operator with 12 aircraft each carrying a 2% in-motion deductible faces unlimited retention exposure across multiple incidents in the same policy year. Negotiating an aggregate cap — typically 2x to 3x the single-occurrence deductible — protects against a bad year. Expect to pay 5% to 10% more in premium for the cap, which most large operators consider worth it.
What gets missed when negotiating deductibles?
The single most common oversight is failing to align the deductible with hangar and ground handling contracts. If your FBO contract limits their liability to $250,000 per occurrence and your not-in-motion deductible is $25,000, a $400,000 hangar rash claim leaves you eating the deductible plus the gap above the FBO's cap. The deductible strategy has to be set against the indemnification language in every hangar, fuel, and ground handling agreement the aircraft touches.
The second oversight is mechanic-in-control sublimits. Many policies apply a separate, higher deductible — often $50,000 to $100,000 — when the aircraft is being moved by maintenance personnel rather than a typed pilot. Owners discover this only after a tug incident at the MRO. Read the warranty schedule and confirm whether the standard in-motion deductible or a maintenance sublimit applies.
Third, named-pilot warranties interact with deductibles. If the policy lists three approved pilots and a fourth flies the airplane, coverage may drop to a much higher deductible tier or void entirely. This is not a deductible strategy question — it is a coverage question — but it surfaces during deductible negotiations and gets missed.
What is a defensible deductible structure for a typical jet owner?
For an owner-flown $12 million light or midsize jet with 250 annual hours, a typed and current pilot with 1,500+ total time, and hangared storage, a defensible structure is a 2% in-motion deductible ($240,000) and a $10,000 not-in-motion deductible, with a disappearing-deductible feature reducing the in-motion retention 25% per claim-free year. Premium on this profile runs $40,000 to $70,000 hull plus liability.
Pushing the in-motion to 3% saves roughly 10% to 12% of premium and adds $120,000 to the retention — a reasonable trade for an owner with liquidity. Pushing to 5% is only defensible for low-utilization aircraft or owners treating the policy as catastrophic coverage. The deductible is a financing tool, not a way to chase the lowest premium quote.
Frequently asked questions
How are aircraft hull deductibles structured?
Aircraft hull policies carry two deductibles: in-motion and not-in-motion. In-motion applies any time the aircraft is moving under its own power or being towed — taxi, takeoff, flight, landing, ground handling. Not-in-motion applies to losses sustained while parked, hangared, or tied down. The two figures are almost never equal, and underwriters at USAIG, Global Aerospace, AIG, Starr, and Berkshire Hathaway Specialty quote them as separate line items.
When does raising the deductible actually save money?
Raising the in-motion deductible saves meaningful premium only when the spread between deductible tiers is wide enough to matter and the owner has the balance sheet to absorb the retention. Moving from a 2% to a 5% in-motion deductible on a midsize jet typically cuts hull premium 15% to 25%. On a $1.2 million hull premium for a $20 million Challenger 350, that is $180,000 to $300,000 in annual savings against a $600,000 increased retention.
What deductible does the underwriter actually want?
Underwriters generally want the deductible high enough that the insured has skin in the game but not so high that small losses go unreported and compound into larger problems. Most carriers cap the in-motion deductible they will offer at 5% of hull value on turbine aircraft, and several will not quote above 3% on aircraft over $25 million in hull value because the absolute dollar retention starts to exceed what they consider prudent for a single insured.
How do disappearing deductibles and aggregate caps work?
Disappearing deductibles erode based on loss size or claim-free renewals. The common structure: the in-motion deductible reduces by 25% per consecutive claim-free year, capped at a 50% reduction after two clean years. Some carriers offer a full waiver of the not-in-motion deductible after three claim-free renewals. These features are standard on owner-flown turboprop and light jet quotes from USAIG and Global Aerospace but are rarely offered on heavy iron or Part 135 risks.
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