Closed preowned business aircraft transactions rose 21 percent year on year to 746 in the first half of 2026, according to the International Aircraft Dealers Association. Inventory available to buy sat at roughly 430 aircraft, 5.8 percent of the active fleet, against a ten year average of 7.2 percent and the lowest level since February 2024.
A market that tight rewards moving fast, and moving fast is the one thing a preowned jet purchase cannot afford. The pre-purchase inspection is the point in the transaction where a buyer finds out what they have actually agreed to buy, and it is the first thing a competitive bidding situation pressures them to shorten.
The sequence, and where the inspection sits
A business aircraft transaction runs in a fixed order, and the inspection comes late enough that a buyer is already committed in principle and early enough that they can still walk.
It starts with a letter of intent, which names the parties, identifies the aircraft by make, model, registration and serial number, and sets the price, the payment terms and the deposit. The letter of intent is not the contract, but it is where the leverage is decided. If it does not say who pays to correct what the inspection finds, that argument gets had later, with money already in escrow and a delivery date approaching.
A good faith deposit follows, typically around 5 percent of the purchase price, held by an escrow agent rather than by the seller. It is refundable up to the moment the buyer accepts the aircraft after the inspection, and non refundable after. That single hinge is why the inspection matters more than any other step: it is the last point at which the deposit still belongs to the buyer.
Then comes the aircraft purchase agreement, then the inspection itself, then technical acceptance, then closing.
What the inspection costs, and how long the aircraft is down
Published 2026 guidance from inspection facilities and aviation finance specialists puts a pre-purchase inspection at roughly 10,000 to 25,000 dollars for a light jet or turboprop, 20,000 to 40,000 dollars for a midsize jet, and 30,000 to 75,000 dollars for a large cabin or ultra long range aircraft. The buyer pays, except where a highly motivated seller agrees otherwise.
Against a purchase price in the millions, those are rounding errors. The real cost is time. West Star Aviation puts the physical inspection at 10 to 12 business days and the records review and report generation at 12 to 15 business days, the latter depending heavily on how old the aircraft is and how well its paperwork has been kept.
Neither figure includes correcting anything. As West Star notes, the total downtime cannot be established until every discrepancy and the corrective action it requires have been identified. A buyer who has budgeted three weeks for an inspection has budgeted for the inspection and not for its consequences.
What a pre-purchase inspection costs, and what it costs in time
The fee is trivial against the purchase price. The schedule is not, and neither figure below includes correcting anything the inspection finds.
Inspection fee by aircraft class, US dollars
Downtime, business days
Business days
Physical inspection of airframe, engines, APU and avionics.
Business days
Records review and report generation, longer on older or badly kept aircraft.
Until findings are in
Rectification of discrepancies. Cannot be scheduled before the inspection reports.
Read it this way. On a large cabin aircraft the inspection fee is a fraction of one percent of the purchase price, so cost is never the reason to shorten the scope. Time is. The two downtime figures overlap in practice but they do not collapse into each other, and the third column is the one that breaks delivery dates.
Inspection fee ranges from published 2026 guidance by inspection facilities and aviation finance specialists. Downtime figures as published by West Star Aviation. Both exclude the cost and schedule of correcting discrepancies.
There is no standard pre-purchase inspection
This is the detail most first time buyers get wrong. There is no regulatory definition of a pre-purchase inspection and no industry standard scope. West Star Aviation is explicit that every facility develops its own checklist based on its own experience, and that some offer three or four different depth levels.
Those levels matter. An aircraft condition survey is essentially a visual walkaround and a records review. A Level 1 inspection adds engine borescopes. Higher levels open panels, inspect inside fuel tanks, pull floorboards to look for corrosion and run full system functional checks. A buyer who agrees to "a pre-purchase inspection" without specifying the level has agreed to nothing in particular.
The scope also determines who has an interest in the answer. The inspection should be carried out by a facility the buyer selects and instructs, not the one that has maintained the aircraft for the seller for a decade.
What a full inspection actually covers
On the airframe: internal fuel tank inspection, landing gear, corrosion checks under the floor, and functional checks of flight controls, trim and pressurisation.
On the engines and auxiliary power unit: ground runs, borescope inspection, checks for foreign object damage, oil sampling and leak testing.
On the avionics: compliance with the pitot static and transponder requirements of FAR 91.411 and 91.413, plus autopilot, navigation, communication and cabin management systems.
The findings that turn up most often are unglamorous: torn or missing seals, illegible placards, fluid leaks, nicks and scratches, corrosion and delamination. Individually trivial, collectively a negotiation.
Who pays for what the inspection finds
The convention is well established and worth knowing before the letter of intent is signed. George Kleros of Jet Support Services describes the split this way: airworthiness squawks, meaning anything that must be corrected before the aircraft can legally fly, usually default back to the seller. Non airworthy items, meaning cosmetic wear on the interior and exterior, are usually deferred or deflected back to the buyer.
That line is where the money is. A worn cabin is the buyer's problem. A corroded structure is the seller's. Everything ambiguous is whatever the purchase agreement says it is, which is the argument for writing the agreement carefully rather than adopting a template.
The sums are not always small. Steve Rogers of Aradian Aviation has cited a windshield delamination on an Embraer Legacy 600 that cost 300,000 dollars to put right. Chris Buchholz of Crew Chiefs frames the general case bluntly: both parties should expect unexpected additional costs.
The paperwork is worth more than the paint
A records review sounds like the boring half of the inspection. It is the half that moves valuations most.
The reviewer is verifying logbook completeness, current hours and cycles, maintenance programme sign offs, overdue items, life limited component status, airworthiness directive compliance, supplemental type certificate documentation, weight and balance records and damage history. A gap in any of those is not an administrative annoyance, it is a permanent haircut on the aircraft's value.
Appraisal specialists put the penalty in bands. A few missing entries typically cost 5 to 15 percent of value. Missing engine logbooks cost 20 to 40 percent. Missing airframe logbooks cost 30 to 50 percent or more, because the aircraft's entire maintenance history becomes unprovable. Some of the damage can be repaired by reconstructing history from FAA records, invoices and mechanic statements, and appraisers will soften the penalty where an owner has done that work, but it never fully closes.
Damage history carries its own stigma independent of the quality of the repair. A properly repaired aircraft with documented damage competes on resale only at a discount, and that discount follows it through every subsequent owner.
Title, liens and the two registries
An aircraft can be mechanically perfect and still be unsellable. Before closing, an escrow agent or aviation attorney searches two registries.
The FAA Civil Aviation Registry in Oklahoma City is the single national record of ownership and liens for every N registered aircraft, running back to first registration. There is no county by county patchwork and no title insurance industry to paper over ambiguity, which makes the search unusually definitive.
The International Registry, established under the Cape Town Convention, records interests in larger airframes and engines. It covers airframes certified for eight or more persons and engines producing at least 1,750 pounds of thrust, which means essentially every business jet. For a jet purchase, the escrow agent files with both.
At closing the escrow agent releases the seller's lien, records the buyer's ownership and attaches the lender's lien in the correct sequence, with no gap in between. Getting that order wrong is how a clean aircraft acquires a clouded title.
Engine programmes, and why lenders ask
Hourly cost maintenance programmes are the last item on the diligence list and one of the most consequential. Jet Support Services covers more than 325 makes and models, and states that its programmes are valued on a par with manufacturer programmes by lenders, appraisers and brokers.
An aircraft enrolled on a programme carries a known forward maintenance cost. An aircraft that is not carries an unknown one, and the next engine shop visit lands entirely on the new owner. Lenders frequently require enrolment for exactly that reason, and a buyer who intends to finance should establish the aircraft's programme status before the inspection rather than after.
The mistake that costs the most
It is not a missed corrosion finding. It is the calendar.
Joseph Simpson of Central Flying Service has pointed to a transaction compressed into 17 days from agreement to close as an example of how not to do it, and his advice is the least complicated thing in the process: give yourself as much time as possible.
In a market where inventory sits near a decade low and good aircraft attract competing offers, the pressure runs the other way. Sellers use scarcity to compress diligence, and buyers accept because they are afraid of losing the aircraft. The deposit is refundable right up until it is not, and the thing that makes it non refundable is technical acceptance signed under time pressure.
A realistic schedule for a large cabin aircraft runs six to eight weeks from letter of intent to closing: two weeks to negotiate and paper the purchase agreement, two to three weeks of inspection and records review, and a further one to two weeks for rectification and closing. Anything materially faster is not efficiency, it is diligence being skipped somewhere.
For buyers still weighing whether ownership is the right structure at all, our comparison of fractional, jet card and charter sets out the hours per year at which each model starts to make sense, and our guide to what chartering a private jet costs covers the alternative that requires no inspection at all. The market context for a purchase decision sits in our report on preowned inventory falling to its lowest level since early 2024.