Observations

May 2026: 36,089,940

Updated: Sep 1, 2026 9:02 AM CDT

Units:

Thousands,

Not Seasonally Adjusted

Frequency:

Monthly

Notes

Title	Release Dates

International Available Seat Miles (ASMs) Scheduled Passenger Flights	2016-04-14	2017-11-15
International Available Seat Miles (ASMs) Scheduled Passenger Flights (DISCONTINUED)	2017-11-16	2018-09-24
Available Seat Miles for U.S. Air Carrier International, Scheduled Passenger Flights	2018-09-25	2026-09-01

Source

U.S. Bureau of Transportation Statistics	2016-04-14	2026-09-01

Release

U.S. Transportation Data	2016-04-14	2021-09-27
Transportation Services Index and Seasonally-Adjusted Transportation Data	2021-09-28	2026-09-01

Units

Thousands	2016-04-14	2026-09-01

Frequency

Monthly	2016-04-14	2026-09-01

Seasonal Adjustment

Not Seasonally Adjusted	2016-04-14	2026-09-01

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 (https://www.transtats.bts.gov/Data_Elements.aspx) 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), U.S. Air Carrier Traffic Statistics reported in BTS' monthly Air Traffic Data release, available here (https://www.bts.dot.gov/statistical-releases).	2018-09-25	2026-09-01

Available Seat Miles for U.S. Air Carrier International, Scheduled Passenger Flights (ASMI)