Definition
STATIONARY AIRSPACE RESERVATION
The term used in oceanic ATC for airspace that encompasses activities in a fixed volume of airspace to be occupied for a specified time period. Stationary Airspace Reservations may include activities such as special tests of weapons systems or equipment; certain U.S. Navy carrier, fleet, and anti-submarine operations; rocket, missile, and drone operations; and certain aerial refueling or similar operations.
- See: STATIONARY ALTITUDE RESERVATION
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).