Nonscheduled Air Transportation (NAICS 48121): A U.S. Industry Primer

A rollup primer for a general investing audience — relevant to both public-market and private investors. Core figures are U.S. federal statistics where noted; forward-looking statements are flagged as judgments, not facts. This level synthesizes three child industries; company-specific detail lives in those primers.

1. Overview

The North American Industry Classification System (NAICS) code 48121 — Nonscheduled Air Transportation — is the business of flying on demand, with no published timetable and no fixed routes. A customer hires an aircraft (and usually its crew) to go where and when they want. That single idea covers three very different businesses: flying people (private-jet and large-aircraft charter), flying cargo (on-demand and contract freighters), and a residual bucket of specialty flying (mixed-use charter, aerial advertising, aviation clubs). [1]

It is a mid-sized slice of aviation — roughly $38 billion of annual receipts, about 1,900 firms, and 72,000 workers — and it shares a common DNA across all three children: it is asset-heavy, safety- and certification-intensive, cyclical, and thin-margin. Operators make money by keeping expensive aircraft flying profitably; when demand softens, the fixed costs of jets, crews, and maintenance bite quickly. [2][3]

The single most useful fact for an investor is that this is largely a private-market industry, and it is getting more so. The scaled operators are mostly held by conglomerates, family-controlled platforms, founders, and — increasingly — private-equity and private-credit funds. Public pure-plays are few, small, and financially bumpy; several of the biggest names were bought out and taken off the public market in the last three years. Where and how you can invest differs sharply across the three children, which is the heart of this primer.

2. What's inside — the three children, and how they differ

NAICS 48121 splits into three industries. They look similar on paper (all are "nonscheduled") but differ in size, growth, ownership, and economics. The contrast is the point:

How to read this. Passenger charter is the big, fragmented, wealth-facing child — most of the receipts and most of the firms. Freight charter is the small-in-count, capital-dense, contract-driven child — only 149 firms but nearly a third of the receipts, and by far the most concentrated. "Other" is the long tail — a quarter of the firms but a sliver of the money, mostly tiny specialty operators. Crucially, the boundaries blur: on-demand aviation platforms bundle passenger charter, fractional, and management revenue that can land in more than one code (flyExclusive, for instance, self-classifies its primary line under 481219 even though most of its flying is passenger charter). [4]

3. How big it is

Our ground-truth federal figures for the whole level (NAICS 48121). Vintages differ by program and should not be read as one single-year financial statement. [2][3]

So: about 1,900 firms, ~72,000 workers, ~$8.7 billion of payroll, and ~$38 billion of receipts. Two ratios describe the level's character. Revenue per worker is roughly $530,000 — the signature of a capital-intensive business where the aircraft, not the headcount, does the earning. Average pay is about $121,000 per worker — high, reflecting a workforce heavy in pilots, flight engineers, and mechanics.

The level "adds up" from its parts, and that is a useful check. Summing the three children's receipts (~$24.7B + $11.2B + $2.3B) lands within rounding of the $38.3B rollup; employment (41,913 + 23,321 + 7,002) and establishments (1,631 + 260 + 621) match the level totals exactly. The figures are internally consistent. [2][3]

Concentration — and why the level looks less concentrated than its freight child. At the whole-level scale the top 4 firms earn ~35% of receipts and the HHI is 408.9 — well below the 1,000 line older federal guidelines treated as "unconcentrated," and far under the 1,800 "highly concentrated" threshold in the 2023 Department of Justice/FTC Merger Guidelines. But that aggregate hides a split personality: the freight child alone is genuinely concentrated (top 4 ~63% of its receipts), while the large, fragmented passenger child dilutes the level's overall HHI. Concentration here is a within-segment story, not a level-wide one. [3]

Undercount and classification caveats — read before quoting the headline. The ~$38 billion captures the nonscheduled charter service core and understates the full "flying-for-hire" economy in several ways:

• The category leaders are buried or off-market. NetJets, the largest passenger operator, is a subsidiary inside Berkshire Hathaway, so its revenue is not visible as a standalone line. Atlas Air and ATSG, the two biggest freight operators, are now private. [8][14][15]
• Revenue booked elsewhere. Fractional-ownership and aircraft-management revenue — a large share of what NetJets, Flexjet, and Vista collect — can be reported under aircraft-leasing or management classifications rather than "chartered air transportation."
• The biggest air-cargo money sits in other codes. FedEx and UPS parcel networks (couriers, 492110), scheduled freighter airlines (481112), and belly cargo in passenger jets are all classified outside 48121. So is most of what a general reader pictures as "specialty flying" — air ambulance (621910), sightseeing (487990), crop-dusting (115112), and flight training (611512). [1]
• Small and individual operators are under-captured. County Business Patterns covers only employer establishments and excludes the self-employed and most government employees; the Economic Census generally excludes government-owned establishments. The long tail of solo owner-pilots in the "Other" child, and government/military airlift capacity across all three, is not fully counted. [5]

The headline is the charter service core, not total spend on flying nonscheduled. No upward adjustment is made here, and no suppressed value is inferred.

4. The investable universe — where value concentrates across the children

The three children offer very different doors. Broadly: passenger charter has a handful of small public operators plus large private pools; freight charter has almost no U.S. public pure-play left; "Other" has none at all. Tickers and company figures are concentrated in this section and Section 10.

Child 481211 — Passenger charter (the largest, most public-accessible child):

• Public routes are small-cap and speculative: Wheels Up Experience (NYSE: UP), a Delta-backed membership/fractional platform (Delta disclosed a ~36% stake); flyExclusive (NYSE American: FLYX), fractional + jet club + charter; and GlobalX (Cboe Canada: JET), large-aircraft passenger charter and ACMI. Volato (NYSE American: SOAR) has largely exited flying. [11][12][13]
• Indirect / diluted: Berkshire Hathaway (NYSE: BRK.A / BRK.B) owns category leader NetJets as a sliver of a giant conglomerate. Joby Aviation (NYSE: JOBY) owns Blade's former short-haul passenger business — an electric-air-taxi bet, not classic charter. [8][14][24]
• The biggest value pools are private: NetJets (Berkshire), Flexjet (Directional Aviation; took an $800M investment led by luxury group LVMH's L Catterton in 2025), and Vista Global (VistaJet/XO; funded in the high-yield bond market, ~$2.9B revenue). [8][9][10]

Child 481212 — Freight charter (the value has left the public market):

• The two U.S. leaders are private: Atlas Air Worldwide (Apollo-led buyout, 2023) and ATSG (Stonepeak, 2025), plus family-owned Kalitta Air. [14][15]
• Listed exposure is thin and mostly indirect: Cargojet (TSX: CJT, Canada) is the closest listed pure-play; otherwise investors ride the demand engine through Amazon (NASDAQ: AMZN), the freighter supplier Boeing (NYSE: BA), and aircraft lessors like AerCap (NYSE: AER). [17][18]

Child 481219 — Other (no public pure-play):

• The core (aerial advertising, mixed charter, aviation clubs) is entirely private — hundreds of small owner-operated firms plus icons like the Goodyear blimp. Public exposure is adjacent only: helicopter-services operator Bristow Group (NYSE: VTOL), electric-air-taxi developers (Joby, Archer NYSE: ACHR), and diversified aviation-services firm Air T (NASDAQ: AIRT). [23][24]

Where value concentrates. Roughly two-thirds of the level's receipts sit in passenger charter, yet the largest single operators in both the passenger and freight children are unavailable as clean public equities (NetJets is buried in Berkshire; Atlas and ATSG are private). The practical result: public-market investors get small, speculative operators or diluted/indirect exposure, while the scaled, professionalized value is increasingly owned by private equity, private credit, and infrastructure funds.

5. How the money works

The core formula is the same across all three children:

Revenue ≈ fleet × utilization (hours flown) × yield (rate per hour).

The unit of production is the flight hour (or block hour, gate-to-gate time), and it is what every operator reports as its headline volume. Because a jet or freighter carries large fixed costs whether it flies or not, utilization is the swing factor on margin. Where the children diverge is in how the flying is sold — and that changes the risk profile completely:

• Passenger charter earns from ad-hoc charter, jet cards/memberships (prepaid hours), fractional ownership, and aircraft management. Prepaid membership money is real working capital but also a future service obligation. The margin killers are "deadhead" (empty repositioning) legs and low utilization; large fractional networks beat lone operators by filling empty legs. Returns are cyclical and often slim.
• Freight charter leans on ACMI (Aircraft, Crew, Maintenance, Insurance) and CMI wet-lease contracts — the operator supplies the plane and crew, the customer pays a guaranteed rate per block hour and usually covers fuel separately. That gives contracted, recurring, asset-backed cash flow that looks like infrastructure — which is exactly why Apollo and Stonepeak bought the big freighter operators. Indicative widebody ACMI rates run ~$15,000–$25,000+ per block hour. The catch is customer concentration (ATSG's disclosures show a single customer can be a third of revenue). [15][16]
• Other nonscheduled mixes higher-margin-but-lumpy spot and aerial-advertising work with steadier contracted special-mission flying (offshore energy, government) that acts as ballast.

Main cost buckets, common to all three: fuel (a big swing item, though passed through on ACMI freight contracts), crew (pilots are scarce, well-paid, and a large fixed cost), maintenance (which balloons on aging out-of-production widebodies), insurance, and the capital cost of the aircraft. Because assets are expensive and fixed costs high, returns are cyclical — which is why public operators lean on "adjusted EBITDA" and EBITDAR (earnings before interest, taxes, depreciation, amortization, and aircraft rent) milestones in their messaging. [11]

6. What drives demand

The three children ride different demand engines, which is why they don't move in lockstep:

• Passenger charter → wealth and corporate profits. The core customer is the high-net-worth individual and the corporate flyer; demand tracks equity markets, HNWI growth, and the "new-to-private" cohort that COVID created and that partly stuck. Events and seasonality (sports, holidays, corporate travel) drive peak-day spikes. [21][25]
• Freight charter → e-commerce and the belly-capacity cycle. E-commerce has grown from under 10% of global air freight in 2015 to roughly 25–30% today; integrators and airlines increasingly rent lift rather than own it. The central swing factor is belly capacity — when passenger flying shrinks, freighter demand and rates spike; when it returns, freighters face overcapacity. Trade policy (tariffs, the de-minimis change) is redrawing lanes. [18][19]
• Other → discretionary spending plus contracted special-missions. The value of time for executives, advertising budgets tied to sports/events, and steadier offshore-energy and government contracts that stabilize the discretionary swings.

Common across all three: government, military, and humanitarian charter (a steadier, contract-based stream — including the Civil Reserve Air Fleet for freight and passenger airlift), and airline capacity outsourcing during shortages. Fuel prices move cost more than demand on the passenger side (wealthy flyers are relatively price-insensitive) and are largely passed through on freight ACMI contracts. [21]

7. Regulation

Every operator in this level answers to two federal authorities:

• The Federal Aviation Administration (FAA) — safety. On-demand flying uses a Part 135 certificate (14 CFR Part 135, "commuter and on-demand," aircraft ≤30 seats and ≤7,500 lb payload). Larger passenger charter and all-cargo/supplemental operators fly under the more demanding Part 121. Fractional programs use Part 91 subpart K. Certificates govern aircraft, crew qualifications, training, maintenance, and duty/rest rules. [6]
• The Department of Transportation (DOT) — economics. A carrier needs DOT economic authority to provide interstate or foreign air transportation, and must satisfy U.S.-citizenship / foreign-ownership limits (foreign investors capped at 25% of voting equity; U.S. citizens must hold ≥75% voting control) — a rule that shapes deal structures across the level. [7]

Live regulatory issues cut differently by child. On the passenger side, the multi-year Part 380 "public charter" fight (whether scheduled, by-the-seat charter should meet full airline standards) and "grey charter" enforcement (owners flying paying passengers under private-flight rules) are the hot topics. On the freight side, international bilateral agreements, traffic rights, and Transportation Security Administration (TSA) cargo screening dominate. In the "Other" child, air-tour management plans near national parks and the FAA's new "powered-lift" rules for eVTOL air taxis matter most. Across all three, pilot supply and duty rules, tax policy (bonus depreciation), and emissions/noise scrutiny are shared pressures. Regulation is both a barrier to entry and a source of operating risk: a safety event or certificate suspension can destroy utilization and customer trust overnight. [22]

8. Consolidation

The structure is a fragmented base under segment-specific concentrated tops — and capital flows point to more consolidation, not less. The defining recent trend is a take-private wave in which infrastructure, private-equity, and private-credit capital decided these contracted, asset-backed cash flows were worth owning outright:

• Freight: Apollo led the buyout of Atlas Air Worldwide (2023); Stonepeak acquired ATSG (~$3.1B, completed 2025). The two U.S. leaders left the public market. [14][15]
• Passenger: luxury and institutional money is pouring in — L Catterton (backed by LVMH) led an $800M investment in Flexjet (2025, ~$4B valuation); Delta and Certares recapitalized Wheels Up. [9][11]
• Other / edges: roll-ups are happening at the boundaries — air-ambulance (Global Medical Response) and aerial advertising (AirSign) have each consolidated, and Joby folded Blade's passenger network into a future air-taxi operator. [24]

The strategic logic is identical everywhere: spread fixed costs (aircraft, insurance, certification, dispatch, crew training) over more flight hours, and lock in contracted, repeat demand. What limits a single national roll-up — especially in the "Other" child — is the local airport relationships and specialty missions that keep niche operators viable. Institutional and private-credit capital is now a structural presence in the sector, not just family-office money.

9. Risks

Shared across the level:

• Cyclicality and thin margins. Demand tracks wealth (passenger) and commercial activity (freight); a heavy-fixed-cost business feels a downturn fast, and flight hours can fall quickly. Public operators have repeatedly struggled to reach sustained profit. [11]
• Capital intensity and leverage. Multi-million-dollar aircraft, high crew/maintenance costs, and debt-financed fleets. A downturn in rates against a heavy interest and maintenance bill is the classic failure mode (it took Western Global Airlines into Chapter 11 in 2023). [11]
• Fuel, crew, and insurance. Fuel spikes squeeze margins; pilots and mechanics are scarce and expensive; a single accident can spike premiums and ground a fleet.
• Safety and certificate risk. An accident, violation, or certificate loss can be existential for a small operator and reputationally damaging for a large one.
• Limited disclosure. With category leaders private (Atlas, ATSG) or buried (NetJets), public investors have less visibility into industry health, and federal data miss part of the small-operator and government-linked tail. [5]

Segment-specific:

• Passenger: demand normalization off the 2022 peak, softening pricing power, and SPAC-era public-equity execution risk (Wheels Up has done multiple reverse splits).
• Freight: severe customer concentration (one buyer can be a third of revenue), a belly-capacity glut if passenger widebody flying returns strongly, and aging-widebody maintenance risk. [16]
• Other: technology disruption in both directions — eVTOL air taxis and drones could either enlarge or cannibalize low-altitude aerial work.

10. How to invest and the outlook

Match the route to the child. These are three different investments wearing one NAICS label:

• Passenger charter (481211) is the only child with a menu of direct public plays — but they are small, speculative turnarounds: Wheels Up (UP), flyExclusive (FLYX), GlobalX (JET). Berkshire (BRK.A/B) gives diluted exposure to NetJets. Private investors reach the biggest pools through PE/luxury capital (as L Catterton did with Flexjet) or participate as customers via jet cards and fractional shares — though a fractional share is exposure to the asset, not to operator equity. [8][9][11][12][13]
• Freight charter (481212) is now largely a private and private-equity industry. Public options are Canada's Cargojet (CJT) or indirect demand/supply names (Amazon, Boeing, lessors AerCap/Air Lease). A future IPO or re-listing of Atlas or ATSG — a common PE exit — is the most likely way the U.S. leaders return to public markets. [14][15][17][18]
• Other (481219) offers no public pure-play; the core is a private-market, small-cap, roll-up opportunity, with adjacent public bets in helicopter services (Bristow) and eVTOL developers (Joby, Archer) best treated as options, not cash flow. [23][24]

Diligence questions that apply across the level: How much revenue is recurring (memberships, contracted ACMI) versus ad-hoc/spot? What are utilization, revenue per flight/block hour, completion, and empty-leg rates? Can fuel and labor costs be passed through? How concentrated are the customer, government, and airline contracts? What is cash flow after aircraft purchases, maintenance, leases, and debt service? Are safety certificates, insurance, and pilot staffing robust?

Near-term outlook (forward-looking judgment). The three children are diverging in the short run: passenger demand is re-accelerating off the 2022 peak while pricing discipline returns; freight growth has softened in the latest global outlook even as tight freighter supply supports rates; "Other" stays mature and fragmented. The shared secular tailwinds are real — wealth creation, e-commerce, and the professionalizing effect of institutional capital and consolidation. But returns are less certain across all three: high fixed costs, demanding safety obligations, volatile fuel and labor, and fragmented disclosure. [18][19][25]

For most investors this is a small, specialized allocation, not a core holding — and the honest framing is that the industry's best-run, scaled value is increasingly owned privately. The watch-items are the same everywhere: fuel prices, pilot supply, the pace of key rulemakings (Part 380 for passengers, powered-lift for "Other"), trade policy for freight, and whether the handful of public operators can finally convert flight-hour growth into sustained profit.

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Sources

1. U.S. Census Bureau, 2022 NAICS — 48121 Nonscheduled Air Transportation and children 481211 / 481212 / 481219 (definitions and cross-references). https://www.census.gov/naics/?input=48121&year=2022
2. U.S. Census Bureau, County Business Patterns, 2023 — NAICS 48121 (establishments, employment, annual and Q1 payroll). https://www.census.gov/programs-surveys/cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms, NAICS 48121 (receipts, firm count, CR4/CR8/CR20/CR50, HHI 408.9). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN?codeset=naics~48121
4. flyExclusive, Company Information / Investor FAQ (primary NAICS 481219 despite mostly passenger charter). https://ir.flyexclusive.com/company-information
5. U.S. Census Bureau, County Business Patterns and Economic Census methodology (coverage caveats: employer establishments only; government-owned generally excluded). https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
6. Federal Aviation Administration, Types of Operations — Part 135 (commuter/on-demand) and Part 121 (supplemental). https://www.faa.gov/hazmat/air_carriers/operations
7. U.S. Department of Transportation, U.S. Air Carriers — economic authority and citizenship / foreign-ownership limits. https://www.transportation.gov/policy/aviation-policy/licensing/US-carriers
8. Berkshire Hathaway Inc., 2025 Annual Report (NetJets, the world's largest fractional operator). https://www.berkshirehathaway.com/2025ar/2025ar.pdf
9. CNBC, LVMH-backed L Catterton takes Flexjet stake ($800M raise, ~$4B valuation), 2025. https://www.cnbc.com/2025/07/21/lvmh-l-catterton-flexjet-stake.html
10. Private Jet Card Comparisons, S&P affirms Vista Global B+ rating on ~$2.9B 2025 revenues, 2026. https://privatejetcardcomparisons.com/2026/04/18/sp-affirms-vista-global-b-rating-based-on-operating-performance/
11. Wheels Up Experience, Form 10-K, FY2025 (revenue $736.5M; Delta ~36.3% stake and term loan). https://www.sec.gov/Archives/edgar/data/1819516/000162828026016512/up-20251231.htm
12. StockTitan, flyExclusive record preliminary 2025 results (~$374–378M revenue), 2026. https://www.stocktitan.net/news/FLYX/
13. Global Crossing Airlines Group (GlobalX), Form 10-K, FY2025 (passenger charter vs. ACMI block hours). https://www.sec.gov/Archives/edgar/data/1846084/000119312526093148/jetmf-20251231.htm
14. Apollo Global Management, Investor Group Led by Apollo, with J.F. Lehman and Hill City Capital, Completes Acquisition of Atlas Air Worldwide, 2023. https://ir.apollo.com/news-events/press-releases/detail/435/investor-group-led-by-apollo-together-with-j-f-lehman
15. Stonepeak, Stonepeak Completes Acquisition of ATSG (~$3.1B, completed 2025). https://stonepeak.com/news/stonepeak-completes-acquisition-of-atsg
16. Air Transport Services Group, Form 10-K for 2024 (customer concentration: Amazon ~33%, DoD ~29%, DHL ~14%). https://www.sec.gov/Archives/edgar/data/894081/000143774925005937/atsg20241231_10k.htm
17. Cargojet Inc. / STAT Times, Cargojet full-year 2024 results (~C$1.0B revenue; ~41 aircraft; charter +58.8%), 2025. https://www.stattimes.com/air-cargo/cargojet-2024-revenue-hits-1-billion-1354529
18. FreightWaves; Flight Global, Amazon Air / ATSG operating agreements; Amazon shipped ~5.9B packages (+16%), 2024. https://www.freightwaves.com/news/amazon-hires-atsg-to-fly-10-boeing-767-freighters
19. IATA; Air Cargo News, Global air-cargo demand +3.4% record in 2025; 2026 outlook cut toward ~flat globally; e-commerce ~25–30% of air freight, 2026. https://www.iata.org/en/pressroom/2026-releases/2026-01-29-01/
20. U.S. Air Mobility Command, Civil Reserve Air Fleet (CRAF) fact sheet. https://www.amc.af.mil/About-Us/Fact-Sheets/Display/Article/144025/civil-reserve-air-fleet/
21. Mordor Intelligence; IBISWorld, Private Jet Charter Services Market (U.S. ~$25–29B, 2025). https://www.mordorintelligence.com/industry-reports/private-jet-charter-services-market
22. Cranfill Sumner LLP; Aviation Week, Part 380 "public charter" rulemaking and SkyWest Charter battleground (DOT order Aug. 2025). https://www.cshlaw.com/resources/fasten-your-seatbelts-public-charters-face-regulatory-headwinds/
23. Bristow Group Inc. (NYSE: VTOL), Full-Year 2024 Results (~$1.4B revenue; ~210 aircraft; offshore-energy and government SAR). https://www.bristowgroup.com/investors/
24. Joby Aviation, Joby Completes Acquisition of Blade's Passenger Business (completed Aug. 29, 2025); FAA powered-lift rule. https://ir.jobyaviation.com/news-events/press-releases
25. Doug Gollan, Forbes, Private Jet Demand Takes Off Despite Increased Fuel Prices (N. American activity ~+4–5% early 2026), 2026. https://www.forbes.com/sites/douggollan/2026/05/14/private-jet-demand-takes-off-despite-increased-fuel-prices/