A communications terminal comprises data interface, a transport selection processor and a plurality of communications modems. The data interface receives input data from application sessions for transmission over a data communications network. Each of the application sessions imposes respective transmission requirements for transmission of the data over the data communications network. Each of the communications modems transmits the input data over the data communications network via a respective transmission platform, wherein each transmission platform exhibits respective transmission characteristics based on a transmission technology of the transmission platform. The modems are configured to transmit the input data simultaneously. For each of the application sessions, the transport selection processor selects a one of the modems, for transmission of the input data of the respective application session over the data communications network, based on the respective transmission requirements of the application session and the transmission characteristics of the respective transport platform.