Source: U.S. Bureau of Transportation Statistics  

Release: Transportation Services Index and Seasonally-Adjusted Transportation Data  

Units:  Thousands, Seasonally Adjusted

Frequency:  Monthly

Notes:

Data from all U.S. air carrier international, scheduled passenger flights. International data includes U.S. carrier operations to and from the U.S. and from one foreign point to another foreign point. BTS’ Airlines and Airports available here does not include U.S. carriers’ foreign point-to-point flights.

This data is collected by the U.S. Department of Transportation, Bureau of Transportation Statistics (BTS) calculation from BTS U.S. Air Carrier Traffic Statistics reported in BTS' monthly Air Traffic Data release, available here.