Definition
A specific, named point on the border between two countries used in air traffic control to define where an aircraft transfers from one nation's airspace and ATC system to the next. International boundary points appear on flight plans, route charts, and ATC clearances as defined fixes for crossing a national frontier.
Plain English
A named spot on the line between two countries where an aircraft officially crosses from one country's airspace into the other.
Context Anchor
Seen in route planning, flight plans, ATC clearances, and NOTAM-related material for international operations.
Derivation
International means “between nations.” Boundary means a dividing line. Point means a specific location. Together, the term points to one exact place used to mark a border crossing in aviation.
Why Pilots Care
Identifies the exact point at which border-crossing procedures, flight plan updates, and ATC handoffs must occur.
Intuition Check
An IBP is not a customs stop or a place where you land. It is a defined location used to describe where the aircraft crosses an international boundary.
Example Sentence 1
The flight plan listed an IBP where control would pass from Vancouver Center to Seattle Center.
Example Sentence 2
The route was filed via the IBP to ensure legal entry into Canadian airspace.