The Worldwide Slot Guidelines (WSG) is published by IATA to provide the global air
transport community with a single set of standards for the management of airport slots at
coordinated airports and planned operations at facilitated airports. The management of
airport slots is required at some airports where the available airport infrastructure is
insufficient to meet the demand of airlines and other aircraft operators while the
management of planned operations at facilitated airports allows a degree of scheduling
flexibility within available airport infrastructure capacity.