NOTE: TSI is updated monthly. The index numbers for the latest three months are considered to be preliminary. BTS releases the preliminary number for the latest month and replaces the number for the oldest preliminary month with a revised number. All other revisions are held until a bi-annual comprehensive revision of the TSI, which will be released as part of the July 2009 TSI release.
SOURCES: TSI numbers are BTS estimates.
Monthly Gross Domestic Product (GDP) Quantity Index numbers are BTS estimates based on Quarterly GDP data published by the Bureau of Economic Analysis (BEA).
