The datalink initiation and capability (DLIC) service is a pre-requisite for the initiation of CPDLC and ADS-C applications as detailed in ICAO/EUROCAE standards. The DLIC service is invoked when the flight deck crew issues a CM-logon request which indicates the supported applications and their versions. ANSPs need to be aware of the logon status to establish CPDLC connections and the ACS needs to be aware of the logon status to establish ADS-C contracts. Requesting the flight deck crew to manually issue two CM-logon requests is inefficient, especially when one considers that for the current ATN B1 datalink operations, not all crews perform this task. Therefore, the ground sharing of information between ANSPs and the Logon Service is essential. The Logon Service has been developed by the OEP 12.2 CONOPS document [5] and detailed in the Specification for Data Link Common Services for the Aeronautical Telecommunication Network (ATN) [1]. It also specifies the use of CM-forward and CM-contact services. All sources can be found in the EUROCONTROL Specification for Data Link Ground Distribution SWIM Services.