{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"observations","count":5,"filters":{"markets":["us-airline-domestic-passengers","us-search-engine-usage"],"marketsMatched":true,"matchedMarketCount":2,"matchedMarketSlugs":["us-airline-domestic-passengers","us-search-engine-usage"],"unmatchedMarkets":[]},"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-search-2023","marketId":"mkt-search","year":2023,"hhi":7950,"concentrationClass":"highly_concentrated","totalMarketSize":null,"marketSizeUnit":null,"sourceNotes":"StatCounter reports U.S. all-platform search engine referral shares for April 2023.","dataStatus":"estimated_public","confidenceLevel":"medium","calculationMethod":"computed_from_public_shares_with_residual_other","sourceId":"statcounter-search-us-2026","sourceUrl":"https://gs.statcounter.com/chart.php?device=Desktop%20%26%20Mobile%20%26%20Tablet%20%26%20Console&device_hidden=desktop%2Bmobile%2Btablet%2Bconsole&multi-device=true&statType_hidden=search_engine&region_hidden=US&granularity=monthly&statType=Search%20Engine&region=United%20States%20of%20America&fromInt=202304&toInt=202604&fromMonthYear=2023-04&toMonthYear=2026-04&csv=1","sourceName":"Search engine market share in United States of America April 2023","sourcePublisher":"StatCounter Global Stats","dataYear":2023,"methodologyNote":"HHI is computed from six named StatCounter shares and a residual Other category that closes coverage to 100 percent.","notes":"April snapshot from a monthly referral-share series; 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