Ancillary revenue is now expanding at twice the pace of total airline revenue, and that divergence shows no sign of narrowing. Those figures originate from IdeaWorksCompany, whose 2026 SeatMaps.com Yearbook of Ancillary Revenue draws on 2025 data across 63 airlines. Among comparable carriers over the period studied, a $13.2 billion uplift makes it abundantly clear where airlines are turning when base fare growth runs out of road.
That growth sits inside a broader industry that IATA forecasts will generate total revenues of $1.053 trillion in 2026, up 4.5% on the prior year. Net profit is forecast at $41 billion, with a net margin of 3.9% and an average profit per passenger of just $7.90. Those thin margins are precisely what makes ancillary income so valuable: it flows at higher incremental margins than base fares, and it has proved far more elastic in growth terms.
Why $13.2 Billion More in Ancillary Revenue Matters in a Thin-Margin Industry
IATA forecasts operating expenses of $981 billion in 2026, up 4.2%. Against that cost base, a $13.2 billion lift in ancillary revenue among the studied carriers is not a rounding error. It is the difference between a profitable year and a marginal one for many carriers.
Fuel costs offer no relief. According to IATA's projections, consumption will climb to 106 billion gallons in 2026, a 2.7% rise on the 103 billion gallons burnt in 2025. In our earlier analysis of the 67% fuel cost spike we examined the strategies carriers deployed to recapture surging fuel expenditure. The conclusion held then as it does now: fare recovery covers only part of the shortfall, and ancillary revenue does the work that ticket pricing alone cannot.
Sustainability obligations pile further pressure onto already tight margins. IATA's figures point to SAF incremental costs of $4.5 billion in 2026, a supply of just 2.4 million tonnes placing the fuel at 0.8% of total consumption. On top of that, CORSIA compliance costs are forecast to climb from $1.3 billion in 2025 to $1.7 billion in 2026. Passengers encounter these expenses only indirectly for now, yet the squeeze on margins they produce is precisely what makes ancillary income a structural necessity rather than an optional revenue line.
The Loyalty Dimension: When a Programme Becomes Collateral
Nowhere is the maturation of ancillary thinking more vividly demonstrated than in the monetisation of loyalty programmes. Between July 2020 and March 2021, securitisations backed by those programmes enabled Delta, United and American to raise a combined $25.8 billion, with DWU Consulting breaking that down as $9.0 billion for Delta, $10.0 billion for American and $6.8 billion for United. What had long been spoken of as a marketing function had, in practice, become the single most bankable asset sitting on any of those balance sheets.
DWU Consulting reports that United subsequently repaid all of its MileagePlus loyalty-secured debt in 2024 and 2025, a sign that the asset held its value. The fact that a points currency could underpin billions in secured financing shows how completely the ancillary model has matured at the largest full-service carriers.
For readers who want to explore individual carrier performance, our Airline Search tool covers the full range of carriers referenced in the Yearbook.
Full-Service Carriers and the Unbundling Frontier
The Yearbook's scope, 63 airlines in its 19th year of publication and running to 110 pages, is wide enough to show that unbundling is no longer a low-cost phenomenon. Full-service carriers have adopted seat selection fees, checked baggage charges for lower fare classes, premium economy upsells and co-branded credit card revenues that once belonged exclusively to the low-cost and ultra-low-cost segment.
The collapse of Spirit, which we examined in our analysis of the ultra-low-cost model, is a reminder that ancillary revenue alone cannot rescue a structurally weak operation. But Spirit's fate does not undermine the unbundling logic: it underlines that ancillary income works best as a supplement to a healthy core business, not a substitute for one.
The IdeaWorksCompany Yearbook, sponsored by SeatMaps.com and provided free of charge, notes that ancillary revenue grew at double the rate of overall airline revenue among the airlines studied. Djois Franklin, Chief Executive of SeatMaps, framed it this way: "Ancillary revenue growth on the pace and scale revealed in this Yearbook, double the rate of overall revenue and increasing $13.2 billion among like-for-like airlines, puts a spotlight on how both core and ancillary products are merchandised."
The word "merchandised" is doing real work in that sentence. The shift from selling seats to selling a bundle of separable products requires a retail capability that many carriers have spent years building, and the Yearbook's figures suggest that investment is paying off.
A Fleet Getting Older, and What That Means for Onboard Revenue
One complicating factor deserves attention. IATA projects that average aircraft age will exceed 15 years in 2026, the highest figure ever recorded, as supply chain difficulties delay new deliveries. An ageing fleet constrains the premium cabin retrofits, Wi-Fi installations and seatback entertainment upgrades that support some of the fastest-growing ancillary categories.
We covered the connectivity side of this in our piece on easyJet, Starlink and the case for inflight Wi-Fi. Connectivity is itself an ancillary product, whether sold directly to passengers or monetised through advertising and retail partnerships. A fleet stuck on older airframes cannot as easily offer it.
The Bottom Line
The IdeaWorksCompany figures make a clear case: ancillary revenue is not a margin enhancer at the edges of the industry. It is central to how airlines in every segment fund their operations against an IATA-forecast cost base approaching $1 trillion. At double the growth rate of ticket revenue and with $13.2 billion added among the studied carriers alone, the ceiling, if there is one, is not yet in view from the data published. What is visible is that carriers with mature loyalty programmes, flexible fare structures and genuine retail capability are pulling ahead of those that still treat ancillary income as a secondary line.
On 16 September 2026, IdeaWorksCompany released version 1.1 of its 2026 Yearbook, an updated edition incorporating corrections to the one-page listings for Emirates and Volaris.
This article draws on information from IdeaWorksCompany and IATA and reporting by DWU Consulting.
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