Plain English Meaning
A written agreement that spells out, in advance, exactly how two ATC facilities (or an ATC facility and another group, like a military unit) will work together — who does what, when, and where — so traffic moves smoothly between them.
Full Definition
A formal written document between two air traffic facilities, or between an ATC facility and another aviation entity, that defines specific procedures and responsibilities for handling traffic, sharing airspace, or coordinating operations at the boundaries where their areas of responsibility meet.
Context Anchor
Seen in air traffic control and airspace coordination discussions, especially when airports, control towers, flight schools, military units, or event organizers need agreed local procedures.
Why Pilots Care
These agreements determine whether certain airspace is , at what times, and under what , directly affecting planning and .