To optimize aircraft operations and the use of airspace, the concept of Reduced Vertical Separation Minimum (RVSM) has been introduced and applied to the airspace between flight level (FL) 290 (29,000 feet) and FL 410 (41,000 feet), inclusive. In this regard, the vertical separation minimum (VSM) between aircraft has been reduced from 2,000 feet to 1,000 feet as shown below:

While the airspace capacity has almost doubled, an aircraft flying in the RVSM airspace could also operate at its optimum flight level, enabling fuel efficiency as well as reducing flight delay resulting in less operational costs for aircraft operator. The RVSM airspace is considered to be the special qualification airspace. The operator and aircraft used by the operator need to be inspected and approved by the responsible authority before conducting flight in the RVSM airspace.