This guide has been compiled to give the first-time user a broad outline on how to compose a slot clearance message for any of the airports, for which Airport Coordination Limited is responsible. This guide will enable you to request a slot clearance at any coordinated airport world-wide. However, it is recommended that new users of SSIM (Standard Schedules Information Manual) should obtain a copy of the Standard Schedules Information Manual from IATA.
SSIM has strict rules defined so that communication can be understood by humans, machines and interactive processes.
There are two standard SITA message associated with Airport Clearance Requests.
SCR Schedules Clearance Request is used for Coordinated Airports (level 3)
SMA Schedule Movement Advice is used for requests at Schedules Facilitated Airports (level 2)
There are two standard SITA messages for Slot/Schedule Information Requests,
SIR Slot/Schedule Informational Request/Reply, to clarify slots held by the Coordinator or to enquire about slots held at a specified airport
SAQ Slot/Schedule Availability Query, to enquire about availability of slots (what if scenario) and the coordinator replies with possibilities