Definition
An airspace of defined dimensions within which flight information service and alerting service are provided by the FAA. The United States is divided into multiple Flight Information Regions, each managed by an Air Route Traffic Control Center (ARTCC), covering both domestic airspace and large portions of international airspace over the oceans where the U.S. has accepted responsibility for providing these services.
Plain English
A large block of airspace where the FAA is responsible for giving pilots flight information and watching out for aircraft in distress. The U.S. is split into several of these regions, and each one is run by a regional control center.
Context Anchor
Seen in FAA discussions of rules and procedures that apply within U.S.-managed airspace, including airspeed limits and instrument flight operations.
Derivation
Flight Information Region' is the standard ICAO term for an airspace block where a country provides flight information service. The U.S. uses the same naming convention so that its regions fit cleanly into the worldwide system of FIRs.
Why Pilots Care
Knowing the boundaries tells a pilot which country supplies services and which rules apply, especially near borders or over water.
Intuition Check
Do not read “region” as just a general area on a map. Here it means a defined airspace responsibility area where the United States provides specific flight safety services.
Example Sentence 1
The flight crossed from the New York FIR into the Gander FIR partway across the North Atlantic.
Example Sentence 2
Even in remote areas inside the United States Flight Information Region the controller could still issue traffic advisories.