For optimization purposes, information are sent only when a new security policy for a new coming data stream has to be established. We have eliminated SNMP polling-based collecting technique in order to reduce excessive usage of network resources. Then, the information exchange is initiated when a new data flow has to be secure. The extra delay for the
user application induced by this transfer remains low given that network or system information are only exchanged on the aircraft segment of the whole communication. It means that only entity such as ATN or NG routers, SMP or satellite terminal can be involved in this information transfer. Indeed, we consider that both network and system bottlenecks
are onboard or on the air-ground satellite link and so we do not need to exchange network or system information with ground entities. Note that information on the air-ground satellite link is provided by the onboard satellite terminal.