{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"markets","count":1,"filters":{"market":"us-airline-domestic-passengers","matched":true,"marketId":"mkt-airlines","slug":"us-airline-domestic-passengers","name":"U.S. domestic airline passengers"},"rows":[{"id":"mkt-airlines","slug":"us-airline-domestic-passengers","name":"U.S. domestic airline passengers","shortName":"Domestic airlines","geography":"United States","sector":"Transportation","dataVintage":"2026","naicsCode":"481111","industryHref":"/industries/481111","crosswalkHref":"/markets/economy?bridgeMarket=us-airline-domestic-passengers&bridgeNaics=481111#market-industry-crosswalk","latestHhi":null,"concentrationClass":null,"cr4":69,"topFirmShare":17.8,"hhiAtOrAbove2500":null,"hhiDisclosureGap":true,"dataStatus":"incomplete","confidenceLevel":"high","sourceCount":1,"policySourceCount":2,"policyEventCount":2,"reportCount":2,"briefAction":"Publish firm-level shares, ownership/control links, and market-definition notes before public agencies rely on private estimates.","briefActionLevel":"Evidence build","briefChange":"The current public record does not provide a definition-stable firm-level HHI series.","briefComparisonDelta":null,"briefComparisonDirection":"unavailable","briefComparisonFromYear":null,"briefComparisonMetric":null,"briefComparisonToYear":null,"briefEvidence":"3 records in the evidence custody chain, 11 latest share rows, 2 linked official records, and 2 related briefs support this profile. Status is incomplete with high confidence.","briefEvidenceState":"aggregate_only","briefGuardrail":"This brief summarizes the observatory's published market screen. It does not define a legal antitrust market, establish market power, identify anticompetitive conduct, estimate consumer harm, or convert descriptive concentration into a causal claim.","briefHeadline":"Domestic airlines: a 69.0% CR4 screen, but no publishable firm-level HHI.","briefHref":"/markets/us-airline-domestic-passengers#overview","briefQuestion":"Which individual firm shares and geographic boundaries are needed to move from aggregate concentration facts to a complete market screen?","briefSourceIds":"bts-transtats-2026|doj-jetblue-spirit-ruling-2024|doj-air-travel-inquiry-2024","briefStructure":"The latest structured aggregate is 69.0%. Individual shares do not close a firm-level distribution, so HHI remains withheld."}]}