The following interfaces shall allow for the selection of subscription based on clearly defined criteria: Flight Status Subscription Management Interface, Subscription Management Interface. Subscription and AMQP 1.0 message filtering can be done based on the value of this "application-property" using the "APACHE.ORG:SELECTOR" syntax. The service may support other filters based on the operators defined in the OGC Filter Encoding 2.0 Encoding Standard on a case by case basis.