Scheduled Air Transportation (U.S.) — Industry-Group Primer

NAICS 2022 code 4811. NAICS is the North American Industry Classification System, the standard the U.S. (United States) government uses to group businesses. This is a four-digit "industry group," and at this level it contains exactly one five-digit child industry: 48111 Scheduled Air Transportation.

1. Overview

This industry group is the business of flying on a published schedule over published routes — passengers and cargo, on a fixed timetable, whether the flight is full or half-empty. It is a large, essential, capital-intensive, and cyclical business, tightly geared to the wider economy: it booms when consumers, companies, and global trade are active, and can lose money fast when fuel spikes or demand softens.

This four-digit group is effectively identical to its one child, 48111. Because 4811 contains only 48111, every dollar of revenue, every worker, and every establishment counted here belongs to that single child. This page gives the group's own ground-truth federal figures and the one-line summary of what's inside; for the full treatment — how passenger and cargo economics differ, the investable universe, regulation, consolidation, and risks — read the 48111 primer, which carries all the detail.

2. What's inside — and why this level equals its one child

The 4811 industry group has a single member:

Because there is only one child, the group and the child are the same population of firms — they report the same receipts, employment, establishments, and concentration. The interesting structure sits below 48111, which itself splits into two six-digit lines: 481111 Scheduled Passenger Air Transportation (~96% of receipts) and 481112 Scheduled Freight Air Transportation (~4%).[1] That passenger-vs-freight contrast — public passenger stocks on one side, mostly private or embedded freight on the other — is the real story, and it lives in the 48111 primer.

3. How big it is (this level's rollup figures)

The figures below are our ground-truth federal data for NAICS 4811. Because the group equals its one child, they are also the 48111 totals.

Annual payroll works out to roughly $102,000 per worker — among the highest in transportation, consistent with a heavily unionized workforce of pilots and mechanics.[3] The HHI (a standard concentration gauge where higher means more concentrated) of 1,349 sits in the "moderately concentrated" band regulators watch; the four largest firms take 69.8% of receipts and the top twenty take 93%.[2]

Vintage caveat. Receipts and concentration are 2022 (Economic Census); employment, establishments, and payroll are 2023 (County Business Patterns, or CBP). Do not blend the two years. Undercount caveat, by child: for the passenger ~96% of the group the federal count is reliable (it is dominated by large public corporations). For the small freight slice the figure is a structural undercount — the two largest cargo fleets in the world (FedEx's and UPS's in-house airlines) are classified as couriers (NAICS 492110), and "belly" cargo carried in passenger jets is booked under passenger air — so true U.S. air freight is roughly an order of magnitude larger than the freight line implies.[3] CBP also covers only employers with paid staff, missing the self-employed and smallest operators, which matters most in the freight-feeder tail where individual and family ownership is common.[4] No values in our file are suppressed.

4. The investable universe — where value concentrates

Value is split the way revenue is, but access is not. Passenger flying is ~96% of the money and is almost entirely reachable on public exchanges — most large U.S. passenger carriers are listed stocks you can buy directly. Freight is the ~4% (understated) remainder and is mostly private or embedded: the dominant U.S. cargo operators sit inside diversified parcel giants (couriers), and the largest dedicated freighters were taken private in 2023–2025. So public exposure concentrates almost entirely in the passenger side of the one child; freight is reached indirectly. Full ticker-level detail is in the 48111 primer, Sections 4 and 10.

5. How the money works

Both halves of the child live on the spread between the price of a unit of capacity and the cost of flying it, and both carry high fixed costs — so small changes in how full the aircraft fly, or in fuel, drop straight to the bottom line. Passenger economics turn on unit revenue versus unit cost, load factor, and — increasingly — high-margin bag fees and co-branded credit-card loyalty revenue. Freight economics turn on aircraft utilization and contract structure, especially ACMI (Aircraft, Crew, Maintenance, Insurance) block-hour deals, where the carrier supplies the plane and its operation for a fixed rate per hour flown while the customer bears the commercial risk. Neither set of metrics can be inferred from the other; the 48111 primer, Section 5, works through both.

6. Demand drivers

Passenger travel is highly income-elastic — consumer confidence drives leisure, corporate profits drive business travel. Air cargo tracks world trade and industrial production and is read as a leading indicator. Fuel is the largest cost swing for both. Over long horizons air traffic grows roughly with or faster than GDP (gross domestic product); the Federal Aviation Administration (FAA) forecasts about 2.4% U.S. passenger growth in 2026, while warning that aircraft-delivery constraints cap near-term capacity.[5]

7. Regulation

The whole group operates under one framework: economically deregulated but heavily safety- and security-regulated. A scheduled carrier needs economic authority from the Department of Transportation (DOT) — which must find it "fit, willing, and able" and U.S.-citizen-controlled (at least 75% U.S.-owned voting interest) — and safety authority from the FAA under Title 14 Part 121, the demanding rulebook for scheduled carriers.[6] Slots and gates at congested airports are scarce and a barrier to entry; the Railway Labor Act governs airline unions; the Department of Justice reviews mergers. Passenger carriers additionally face DOT consumer-protection rules; freight carriers face cargo-security rules. Detail is in the 48111 primer, Section 7.

8. Consolidation

The child is an oligopoly, and consolidation has run in opposite ownership directions: passenger flying consolidated publicly into a "Big Four" through two decades of mergers (the top four take ~70% of receipts), while freight's dedicated fleet consolidated privately — Atlas Air to an Apollo-led group (2023) and Air Transport Services Group to infrastructure investor Stonepeak (2025). Recent passenger moves show tightening antitrust scrutiny (the blocked JetBlue–Spirit deal; Spirit's 2026 shutdown). See the 48111 primer, Section 8.

9. Risks

The same risks hit the whole group: fuel-price shocks (the largest swing factor), cyclicality and demand shocks (recessions, pandemics, geopolitics, trade policy), labor cost and availability, aircraft and engine shortages, and liquidity/leverage on heavy aircraft and lease obligations. Freight-specific risks include the 2025 end of the $800 "de minimis" duty exemption (a hit to trans-Pacific e-commerce air demand) and heavy customer concentration. The 48111 primer, Section 9, expands each.

10. How to invest, and the outlook

Rule of thumb: the passenger side of the child is where you buy a company (listed carrier stock or bonds); the freight side is where you buy an asset or a fund (diversified logistics stocks, the aircraft maker, lessors, or private-equity/infrastructure funds and private credit). Profitability is modest even in good years — the Bureau of Transportation Statistics reports about a 2.4% net margin for U.S. airlines in 2025, and the International Air Transport Association (IATA) expects a ~3.9% global net margin in 2026.[7][8] The unifying theme: growth is not the same as investable profit — returns favor operators with disciplined capacity, credible liquidity, and durable advantages. For the full investable universe, tickers, and outlook, see the 48111 primer, Section 10 — it is, at this level, the whole story.

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Sources

1. U.S. Census Bureau, "2022 NAICS Definitions: 48111 Scheduled Air Transportation; 481111 Scheduled Passenger Air Transportation; 481112 Scheduled Freight Air Transportation." https://www.census.gov/naics/?details=48111&input=48111&year=2022
2. U.S. Census Bureau, 2022 Economic Census, "Concentration of Largest Firms for the U.S.: 2022," NAICS 48111 (receipts, firm counts, CR4/CR8/CR20/CR50, HHI). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN?codeset=naics~48111
3. U.S. Census Bureau, County Business Patterns, 2023, NAICS 48111 (employment, establishments, annual and first-quarter payroll). https://data.census.gov/table/CBP2023.CB2300CBP
4. U.S. Census Bureau, "County Business Patterns Methodology" (coverage/undercount). https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
5. Federal Aviation Administration, "FAA Aerospace Forecast Fiscal Years 2026–2046." https://www.faa.gov/data_research/aviation/aerospace_forecasts/
6. U.S. Department of Transportation, "U.S. Air Carriers — Licensing" (economic authority; citizenship requirements); Federal Aviation Administration, "Regularly Scheduled Air Carriers (Part 121)." https://www.transportation.gov/policy/aviation-policy/licensing/US-carriers
7. U.S. DOT, Bureau of Transportation Statistics, "U.S. Airlines Profited $6.0 Billion in 2025" (net margin), 2026. https://www.bts.gov/newsroom/us-airlines-profited-60-billion-2025-decrease-over-2024
8. International Air Transport Association (IATA), "Airline Profitability Stabilizes with 3.9% Net Margin Expected in 2026," Dec 9, 2025. https://www.iata.org/en/pressroom/2025-releases/2025-12-09-01/