{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"atlas","updatedThrough":"2026-08-15","guardrail":"The atlas exposes only relationships declared in the current public data. A link or issue grouping does not make unlike measures comparable, establish ownership or control, define an antitrust market, assign liability, or show that a policy event caused an economic outcome.","filters":{"depth":1,"edgeType":"all","edgeTypeMatched":true,"focus":"issue:transportation-networks","focusMatched":true,"kind":"all","kindMatched":true,"layer":"research","layerMatched":true,"query":"","view":"network"},"summary":{"nodeCount":5478,"edgeCount":19193,"sourceCount":45,"profileCount":5433,"nodeKindCount":13,"layerCount":4,"eligibleEdgeCount":547,"matchedNodeCount":5,"plottedEdgeCount":4,"plottedNodeCount":5,"hiddenNodeCount":0,"directNeighborCount":4},"focusNode":{"id":"issue:transportation-networks","kind":"issue","label":"Transportation networks","shortLabel":"Transportation","description":"How do route-level entry, capacity, airport constraints, and consolidation shape passenger choice beyond national shares?","href":"/issues/transportation-networks","metricLabel":"Bounded markets","metricValue":"1","detail":"1 separately defined market / editorial research program","status":"issue program","year":2026,"color":"#c026d3","searchText":"transportation networks transportation routes, airport access, capacity, and consolidation the program places national airline passenger-share reporting beside route-level research needs and official merger and competition records. how do route-level entry, capacity, airport constraints, and consolidation shape passenger choice beyond national shares? which route-pair, airport, schedule, fare, capacity, and entry records define competitive alternatives for travelers? how do slot, gate, loyalty, and network constraints differ across airports and traveler segments? which before-and-after records can evaluate transactions or remedies without attributing every observed change to one event? u.s. domestic airline passengers domestic airlines transportation","connectionCount":4},"nodes":[{"id":"issue:transportation-networks","kind":"issue","label":"Transportation networks","shortLabel":"Transportation","description":"How do route-level entry, capacity, airport constraints, and consolidation shape passenger choice beyond national shares?","href":"/issues/transportation-networks","metricLabel":"Bounded markets","metricValue":"1","detail":"1 separately defined market / editorial research program","status":"issue program","year":2026,"color":"#c026d3","searchText":"transportation networks transportation routes, airport access, capacity, and consolidation the program places national airline passenger-share reporting beside route-level research needs and official merger and competition records. how do route-level entry, capacity, airport constraints, and consolidation shape passenger choice beyond national shares? which route-pair, airport, schedule, fare, capacity, and entry records define competitive alternatives for travelers? how do slot, gate, loyalty, and network constraints differ across airports and traveler segments? which before-and-after records can evaluate transactions or remedies without attributing every observed change to one event? u.s. domestic airline passengers domestic airlines transportation","connectionCount":4,"distance":0,"labelVisible":true,"radius":20,"x":450,"y":260},{"id":"market:mkt-airlines","kind":"market","label":"U.S. domestic airline passengers","shortLabel":"Domestic airlines","description":"Domestic scheduled airline passenger market share based on BTS TranStats for the 12 months ending February 2026. 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connect definition-bound concentration measures, participant shares, historical movement, and public research questions without collapsing unlike markets into one score. a concentration measure is a screen inside its stated product, geography, denominator, and period. it is not by itself proof of market power, harm, causation, liability, or the correct legal market. comparable participant shares, entry and exit, switching, price, quality, capacity, transactions, and stable market-definition records. researchers, journalists, enforcement staff, and public officials ar-sc-2026-01 the u.s. competition landscape ar-mm-2026-01 how hhi helps explain market concentration ar-rb-2026-02 five digital gateways ar-rb-2026-01 beef meatpacking buyer power ar-rb-2026-03 state banking structure, 2015-2025 ar-rb-2026-06 fixed broadband concentration across geographic scales, 2020-2024 ar-rb-2026-07 state individual insurance concentration, 2024 ar-ci-2026-01 latest market-structure signals moved in both directions. ar-ci-2026-02 four digital usage systems traced four different structural paths.","connectionCount":30,"x":598,"y":260,"distance":1,"radius":11,"labelVisible":true},{"id":"topic:geographic-competition","kind":"topic","label":"Geographic Competition","shortLabel":"Geographic Competition","description":"How does competitive structure vary across national, state, county, tract, route, and other local frames?","href":"/research/topics/geographic-competition","metricLabel":"Publication memberships","metricValue":"7","detail":"AR-T04 / 4 issue programs / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t04 geographic competition places how does competitive structure vary across national, state, county, tract, route, and other local frames? connect place-based concentration screens to their exact geography, source vintage, ownership rules, and local-market research needs. a statewide, county, tract, or national screen does not establish a legal geographic market. medians of local hhis are not interchangeable with one national hhi. area-level shares and distributions, ownership and entry histories, local prices and quality, commuting or procurement patterns, capacity, switching, and stable geographic definitions. local officials, researchers, journalists, and community advocates ar-sc-2026-01 the u.s. competition landscape ar-dn-2026-02 housing competition needs local ownership data ar-rb-2026-03 state banking structure, 2015-2025 ar-rb-2026-06 fixed broadband concentration across geographic scales, 2020-2024 ar-rb-2026-07 state individual insurance concentration, 2024 ar-ci-2026-04 geographic concentration screens point in different directions at different scales. ar-ci-2026-05 national fixed-broadband hhi rose while three geographic medians fell.","connectionCount":17,"x":450,"y":408,"distance":1,"radius":11,"labelVisible":true},{"id":"topic:merger-review","kind":"topic","label":"Merger Review","shortLabel":"Merger Review","description":"How are notification volume, transaction mix, review intensity, official outcomes, and observed market structure changing without conflating process with effect?","href":"/research/topics/merger-review","metricLabel":"Publication memberships","metricValue":"3","detail":"AR-T06 / 2 issue programs / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t06 merger review mergers how are notification volume, transaction mix, review intensity, official outcomes, and observed market structure changing without conflating process with effect? keep federal filing, transaction-size, review-process, structural-screen, and official-record evidence in separate but connected lanes. notification counts, second request rates, concentration screens, complaints, settlements, and abandonments have different denominators and meanings. none alone establishes transaction effects or legal merit. transaction-level industry and size, thresholds, exemptions, agency allocation, review timing, outcomes, remedies, market shares, entry, price, quality, and capacity. merger researchers, oversight staff, journalists, and enforcement practitioners ar-sc-2026-01 the u.s. competition landscape ar-rb-2026-05 the federal merger review pipeline, 2016-2025 ar-ci-2026-07 reported hsr volume and the second request rate both moved lower in fy2025.","connectionCount":7,"x":302,"y":260,"distance":1,"radius":11,"labelVisible":true}],"rows":[{"id":"issue-scope:transportation-networks:mkt-airlines","layer":"research","relationshipType":"issue_scope","relationshipLabel":"Issue program membership","fromId":"issue:transportation-networks","fromKind":"issue","fromLabel":"Transportation networks","fromHref":"/issues/transportation-networks","toId":"market:mkt-airlines","toKind":"market","toLabel":"U.S. domestic airline passengers","toHref":"/markets/us-airline-domestic-passengers","evidenceLabel":"Competition issue scope contract","evidenceDetail":"U.S. domestic airline passengers is an explicitly curated member of the Transportation networks research program while retaining its own product boundary, geography, denominator, and comparison contract.","sourceId":null,"sourceUrl":null,"confidenceLevel":"bounded","indicatorId":null,"entityCode":null,"observationCount":null,"firstYear":null,"latestYear":null,"preferredView":null,"sourceIds":null,"guardrail":"An editorial issue membership supports research navigation only; it does not combine the member markets, define a broader antitrust market, or establish competitive harm or causation."},{"id":"topic-issue:geographic-competition:transportation-networks","layer":"research","relationshipType":"topic_issue","relationshipLabel":"Declared issue-program membership","fromId":"topic:geographic-competition","fromKind":"topic","fromLabel":"Geographic Competition","fromHref":"/research/topics/geographic-competition","toId":"issue:transportation-networks","toKind":"issue","toLabel":"Transportation networks","toHref":"/issues/transportation-networks","evidenceLabel":"Research topic issue contract","evidenceDetail":"Transportation networks is explicitly included in the Geographic Competition institutional research contract.","sourceId":null,"sourceUrl":null,"confidenceLevel":"bounded","indicatorId":null,"entityCode":null,"observationCount":null,"firstYear":null,"latestYear":null,"preferredView":null,"sourceIds":null,"guardrail":"A topic-to-issue link records one declared institutional membership. 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