Definition

Flight Level Allocation Scheme (FLAS). The scheme whereby specific flight levels may be assigned to specific route segments within the route network.

Source: ICAO EUR Doc 009: Guidance material on the implementation of a 300 m (1000 ft) vertical separation minimum in the European RVSM airspace

Description

The flight level allocation scheme (FLAS) sets out the main principles of flight level allocation within a portion of airspace, or at the border between two airspaces.