Reporting carrier ≠ brand
Regional affiliates and operating certificates can appear separately from the airline name on the ticket.
Industry lab public U.S. DOT data
The U.S. airline network,
from the planning desk.
A high-level view of where capacity is moving, how fleets are being deployed, where airports are concentrated, and what carriers report financially. Built for curious airline people—without pretending public data can answer everything.
Two reporting systems, two different clocks.
Methodology →
T-100 network views use the loaded multi-year reporting history; annual trends are labeled separately, and growth uses full-year 2025 versus 2024. Form 41 uses the latest common Schedule P-1.2 quarter filed by reporting air-carrier certificates. Figures are reported—not estimates of route profitability.
Executive readout
Four signals worth noticing
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Form 41 · Schedule P-1.2
Quarterly financial scoreboard
Compare major U.S. passenger carriers on the same reported quarter. Dollar figures are airline-level operating results in BTS Form 41—not route economics.
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Margins are operating profit or net income divided by operating revenue for the selected quarter. Certificate-level filings may not match a public parent company’s GAAP presentation or brand network.
T-100 · Capacity
Who added—and pulled—seats?
Year-over-year scheduled capacity direction for the 14 carriers with the most cumulative passengers in this dataset. Regional operators are shown separately from marketing carriers.
more seatsfewer seats
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T-100 · Fleet deployment
Aircraft gauge meets stage length
See how differently carriers deploy capacity. Farther right means longer average stage length; higher means more seats per reported departure. Dot size reflects cumulative passengers.
networkLCCULCCregional
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Gauge = seats ÷ departures. Stage length = available-seat miles ÷ seats. Seat occupancy = passengers ÷ seats and is not RPM/ASM load factor.
T-100 · Market structure
How concentrated are the busiest airports?
HHI summarizes how passenger share is distributed across reporting carriers. A higher score means more traffic is concentrated among fewer certificates.
Competitive < .15Moderate .15–.25Concentrated > .25
| Airport | HHI | Structure | Leading certificate | Passenger observations |
|---|---|---|---|---|
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T-100 · Carrier mix
The industry is more than six logos
Passenger share and capacity recovery by reporting-carrier category. This separates network, low-cost, ultra-low-cost, regional, cargo, and uncategorized operators.
Recovery compares reported seats in full-year 2025 with 2021. “Other” includes foreign and uncategorized reporting carriers; category totals can overlap in route counts and are not a brand-level market-share measure.
Use it like an analyst
Directional, comparable, and deliberately honest.
Public data arrives later
T-100 and Form 41 are excellent for structural analysis, not a real-time operating picture.
No route profit claims
Quarterly airline financials cannot identify whether an individual route makes money.