{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"observations","count":2,"filters":{"report":"public-data-gaps","reportMatched":true,"reportId":"rep-public-data-gaps","reportSlug":"public-data-gaps","reportTitle":"Where Public Market-Share Data Runs Out"},"rows":[{"id":"obs-airlines-2026","marketId":"mkt-airlines","year":2026,"hhi":null,"concentrationClass":null,"totalMarketSize":null,"marketSizeUnit":null,"sourceNotes":"BTS publishes carrier shares and an aggregated Other category for domestic passengers.","dataStatus":"incomplete","confidenceLevel":"high","calculationMethod":"hhi_withheld_aggregated_other","sourceId":"bts-transtats-2026","sourceUrl":"https://transtats.bts.gov/Homepage.asp","sourceName":"TranStats airline domestic market share March 2025-February 2026","sourcePublisher":"Bureau of Transportation Statistics","dataYear":2026,"methodologyNote":"HHI is withheld because Other is an aggregated category rather than firm-level shares.","notes":"CR4 and top carrier share can be reported from the sourced carrier rows.","sourceProfileHref":"/sources/bts-transtats-2026"},{"id":"obs-pbm-2023","marketId":"mkt-pbm","year":2023,"hhi":null,"concentrationClass":null,"totalMarketSize":6.6,"marketSizeUnit":"billion prescriptions dispensed","sourceNotes":"FTC reports aggregate PBM concentration: top three processed nearly 80 percent and top six more than 90 percent of U.S. prescriptions in 2023.","dataStatus":"incomplete","confidenceLevel":"high","calculationMethod":"hhi_withheld_aggregate_public_facts","sourceId":"ftc-pbm-interim-2024","sourceUrl":"https://www.ftc.gov/news-events/news/press-releases/2024/07/ftc-releases-interim-staff-report-prescription-drug-middlemen","sourceName":"Pharmacy Benefit Managers: The Powerful Middlemen Inflating Drug Costs and Squeezing Main Street Pharmacies","sourcePublisher":"Federal Trade Commission","dataYear":2023,"methodologyNote":"HHI is withheld because the public FTC press-release record gives aggregate top-three/top-six shares rather than individual PBM shares.","notes":"Profile shows available public facts and missing data needed for HHI.","sourceProfileHref":"/sources/ftc-pbm-interim-2024"}]}