Whether you are buying your first business jet, repositioning a fleet, or advising a client on the right moment to sell, one question sits underneath every decision: Is this a buyer’s market or a seller’s market? The answer is rarely obvious from headlines or anecdotes. It lives in three measurable indicators that, read together, tell you which way leverage is tilting and how aggressively you can negotiate.
Those three indicators are inventory levels, days-on-market, and the absorption rate. None of them is decisive on its own. Used together, they form a reliable picture of whether a particular aircraft segment is tight, soft, or somewhere in transition.
Inventory Levels: The Percentage of the Fleet for Sale
The most widely watched barometer in pre-owned aviation is the share of an aircraft’s active fleet that is listed for sale. Rather than counting raw listings — which means little without context — professionals express inventory as a percentage of the in-service fleet for a given model.
As a rule of thumb, a balanced market for most business jet types sits around 10 percent of the fleet for sale. When that figure drops toward the mid-single digits, supply is scarce, sellers hold the leverage, and prices firm up or rise. When it climbs into the low-to-mid teens, the market is oversupplied, buyers have their pick, and downward price pressure follows.
Two cautions make this metric more useful. First, watch the direction as closely as the level. A fleet sitting at 9 percent and falling tells a very different story than one at 9 percent and climbing — inventory build is one of the earliest signals that a market is about to soften. Second, distinguish realistic listings from aspirational ones. A meaningful slice of “for sale” inventory at any time is priced above what the market will bear, and those listings inflate the headline number without representing genuine competition for a serious buyer.
Days-on-Market: How Fast Aircraft Actually Sell
If inventory tells you how much supply exists, days-on-market (DOM) tells you how quickly that supply clears. It measures the average time a listing remains active before it goes under contract.
Short and shortening DOM is the signature of a tight market: aircraft transact quickly, sellers field multiple inquiries, and price reductions are rare. Long and lengthening DOM points the other way — buyers can take their time, listings grow stale, and sellers increasingly resort to price cuts to attract attention.
DOM is especially valuable as a confirming indicator. Inventory levels can be distorted by a handful of overpriced or hard-to-move aircraft, but DOM reflects real transaction behavior. When average DOM begins creeping upward across a segment, it often confirms a softening that inventory data is only starting to hint at. It is also worth tracking the spread between asking price and final transaction price alongside DOM; widening discounts and lengthening DOM together are a clear sign that pricing power has shifted to buyers.
Absorption Rate: The Metric That Ties It Together
The absorption rate synthesizes supply and demand into a single, intuitive figure: how long it would take to sell off the current inventory at the recent pace of sales. It is calculated by dividing current inventory by the average number of transactions per month, and the result is expressed in months of supply.
A low absorption rate — a few months of supply — describes a tight, fast-moving market. A high rate, stretching past a year, describes an oversupplied, sluggish one. Because it combines both sides of the equation, the absorption rate often gives the cleanest read of all three. Inventory could look elevated, but if aircraft are selling briskly, the absorption rate stays low and the market is healthier than the raw count suggests. Conversely, modest inventory paired with anemic demand produces a high absorption rate and a genuinely soft market that a simple listing count would miss.
Reading the Three Together
No single number should drive a decision. The discipline is in triangulation — lining the three indicators up and asking whether they agree.
When inventory is low, DOM is short, and absorption is measured in a handful of months, you are unmistakably in a seller’s market: expect firm pricing, fast deals, and little room to negotiate. When inventory is elevated, DOM is stretching out, and absorption runs long, the leverage belongs to buyers, and patience tends to be rewarded with better terms.
The most informative moments are when the signals disagree. Rising inventory but still-short DOM may mean a wave of new listings has hit a market that is, for now, absorbing them — a situation worth watching closely for the moment demand cools. Falling inventory but lengthening DOM can signal that sellers are pulling unsold aircraft rather than meeting the market, masking underlying weakness. These divergences are where careful analysis earns its keep.
Segment Nuance Matters
These metrics behave very differently across the market, so always analyze at the segment — and ideally the model — level rather than treating “business aviation” as one market. Light jets, midsize, super-midsize, and large-cabin aircraft each move on their own cycles. Within a segment, an individual model can be running hot while another runs cold.
Model-specific factors layer on top of the broad numbers. The arrival of a new OEM model routinely loosens the market for the legacy type it replaces, lifting inventory and slowing sales of the older aircraft. Age, total time, engine-program enrollment, and mandate compliance all shape how a specific tail competes within its segment. A clean, low-time, program-enrolled airplane can sell quickly in a market where the broader inventory figure looks soft.
What This Means in Practice
For sellers, these indicators are a timing and pricing tool. A tightening market — falling inventory, shortening DOM, dropping absorption — argues for holding firm on price and even testing the upside. A loosening market argues for pricing realistically from the outset, because chasing a softening market with delayed reductions is how aircraft end up stale and discounted.
For buyers, the same signals reveal where patience pays. A soft market with long absorption and lengthening DOM is the environment in which thorough due diligence, unhurried negotiation, and disciplined offers tend to win concessions. In a tight market, hesitation costs deals, and the buyer who is pre-positioned with financing and inspection arrangements moves first.
For everyone, the takeaway is the same: treat inventory, days-on-market, and absorption as a single instrument panel, watch their trends rather than their snapshots, and read them at the segment level. Done consistently, this is how seasoned buyers, sellers, and appraisers separate market noise from the signal that actually moves a transaction.
This article is intended as general market-analysis guidance and not as a valuation, financial, or transactional recommendation for any specific aircraft.
