Stationary Altitude Reservation (STNR ALT RESERVATION)

An altitude reservation which encompasses activities in a fixed area. Stationary ALTRVs 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.

Source: Pilot Contoller Glossary (PCG)