Definition
A defined block of airspace temporarily set aside for the exclusive use of a specific aircraft or operation, established by air traffic control to keep other traffic clear of that volume during the reserved period. Airspace reservations are typically requested for activities such as military operations, certain government missions, or special flights that require protected airspace.
Plain English
A chunk of sky that ATC blocks off for one specific user during a set time. While the reservation is active, other aircraft are kept out of that area.
Context Anchor
You may encounter this term in flight planning, air traffic notices, or discussions of military, government, or special flight activities that need protected airspace.
Derivation
From 'reserve,' meaning to set aside for a particular use. The word here keeps that everyday sense — a piece of airspace held back for one user, not available to general traffic for the duration.
Why Pilots Care
Pilots must avoid these areas to prevent conflicts with restricted operations and remain in compliance with regulations.
Intuition Check
Do not think of a reservation as just a suggestion or a booking note. In aviation, it means a real block of airspace has been set aside for a specific use during a specific time.
Example Sentence 1
The briefer noted an active airspace reservation along our planned route, so we filed a deviation to stay clear of it.
Example Sentence 2
Military exercises often create temporary airspace reservations that require pilots to file alternate flight plans.