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The Worldwide Airport Slot Guidelines (WASG) are the foundation of the global slot coordination process. The WASG is jointly published by IATA, Airports Council International (ACI) and the Worldwide Airport Coordinators Group (WWACG). The WASG is built on the pillars of transparency, flexibility, certainty, consistency, and sustainability. Thanks to continual update and revision, the WASG represents the globally accepted best practice and ensures that slots at coordinated airports are neutrally and fairly allocated to airlines using consistent policies, principles, and processes.
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Objectives of the WASG
The prime objective of airport slot coordination is to ensure the most efficient declaration, allocation and use of available airport capacity in order to optimize benefits to consumers, taking into account the interests of airports and airlines.
- To facilitate consumer choice of air services, improve global connectivity and enhance competition at congested airports for passengers and cargo.
- To provide consumers with convenient schedules that meet demand, are consistent from one season to the next, and reliable in terms of their operability.
- To ensure that slots are allocated at congested airports in an open, fair, transparent and non-discriminatory manner by a slot coordinator acting independently.
- To realize the full capacity potential of the airport infrastructure and to promote regular reviews of such capacity and demand that enable effectual capacity declarations for slot allocation on a seasonal basis.
- To balance airport access opportunities for existing and new airlines.
- To provide flexibility for the industry to respond to regulatory and changing market conditions, as well as changing consumer demand.
- To minimize congestion and delays.
WASG Annexes
12.1 Amendments to WASG Edition 2 (pdf)
Latest changes to the WASG and updates published
12.2 IATA Slot Conference – Standing Working Arrangements (pdf)
The Slot Conference purpose, organization and accreditation of attendees
12.3 IATA Standards for Airport Capacity Analysis (pdf)
How to complete capacity analysis for the purpose of declaration every season
12.4 Recommended Minimum System Requirements for Airlines and Coordinators (pdf)
Technical system standards for coordination systems and slot tools
12.5 Notification of Airport Level Change (xls)
Form for declaring an airport change in coordination level
12.6 Independence of the Coordinator (pdf)
Best practice principles of independence in coordination and slot management
12.7 Contact list for Level 2 and Level 3 Airports (xls)
The coordinator and facilitator contact details for all coordinated and facilitated airports globally. Last update: 15 April 2024.
12.8 Proposal for Revision of the WASG (pdf)
Form for submitting a request to change the slot guidelines
12.9 Best Practice Guidelines for the Use of Data Analysis in the Slot Performance Process (pdf)
How to use data and analysis to perform Slot Performance Monitoring
12.10 Best Practice Guidelines for Availability of Slots and Schedule Information (pdf)
Slots and schedule information should be provided by the coordinators to the airport managing body for each scheduling season.
WASB Best Practices
Managing temporary reductions of airport capacity (pdf) - Guidance to manage temporary reductions of airport capacity announced after the confirmation of seasonal capacity parameters. All guidance is complementary to the Worldwide Airport Slot Guidelines.