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ACNL aims to ensure that slots are being used as indicated at the time of allocation in order to achieve that scarce capacity is being used in the most efficient way. ACNL will comply with the European Council Regulation 95/93 as amended to monitor the use and adherence of allocated airport slots at all Dutch level 3 coordinated airports.


EC Regulation 95/93, as amended, stipulates that the coordinator shall monitor the conformity of air carriers’ operations with the slots allocated to them. These conformity checks shall be carried out in cooperation with the managing body of the airport and other stakeholders and shall take into account the time and other relevant parameters.
Slot monitoring at coordinated airports is a continuous process designed to ensure that most effective use is made of scarce capacity, an adequate level of service quality is maintained and intentional schedule abuse is separated from the normal variations in operational performance.LES

The main objective of slot monitoring is to identify (possible) problems regarding the use of slots and seek solutions before they occur.

All procedures related to slot monitoring must be based on the principles of neutrality, transparency and non-discrimination.


For monitoring purposes the airlines involved in joint operations, code share agreements etc. are required to make sure that both codes of the flights of the carriers involved are in the airport information systems. Moreover ACNL must be informed by both carriers involved of the details of the slots involved (for example, operating flight number) and the period of the joint operation and/or code share.

It is the responsibility of the airlines to deliver the correct information to ACNL; every change must be sent to ACNL by the slot holder as a SCR (except operational changes on the day of operation).


  • Complying with EC Regulation 95/93, as amended, as well as the EUACA Slot Guidelines ‘Slot Performance Monitoring’ and the IATA Worldwide Slot Guidelines (WSG) provided these guidelines comply with Community law;
  • Ensuring airlines adhere to their allocated slot times;
  • Preventing slot abuse;
  • Identifying air carriers that operate services at a time significantly different from the allocated slot as part of a series or slots in a significantly different way from that indicated at the time of allocation.
Types of monitoring





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