National-Level ATPI Series

NOTE: The U.S. Origin ATPI trend line depicts quarterly changes in airfares for all domestic-origin itineraries. For further details about the ATPI, see our Frequently Asked Questions and Technical Notes.

SOURCE: Bureau of Transportation Statistics

There are three primary ATPI series:

• The U.S.-Origin ATPI measures change in the cost of itineraries originating in the United States, whether the destinations are domestic or international.
• The Foreign-Origin ATPI measures change in the cost of itineraries with a foreign origin and a U.S. destination.
• The Full-Scope ATPI combines the domestic and foreign-origin itineraries.

All the ATPI series appearing in this release use the first quarter of 1995 as the base period against which price changes are measured.