A system includes a satellite communications terminal including a computer programmed to provide communications for user devices with a destination network. The computer detects a physical state or change in a physical state specified as a trigger to transfer the communications for the user devices with the destination network from a satellite communications channel to a cellular communications channel. Upon detecting the trigger event, the computer establishes a communications link with a cellular device and provides communications for the user devices with the destination network via the cellular device and the cellular communications channel.