{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"observations","count":1,"filters":{"sector":"Transportation","geography":null,"class":null,"vintage":null,"status":null,"confidence":null,"matchedMarkets":1},"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"}]}