A user interface for an avionics interface device. The interface includes a display, selectable keys, and three annunciations. The keys include alphanumeric, functional, and line select keys. The functional keys are positioned above the display. The alphanumeric keys are positioned below the display. First and second portions of the line select keys are positioned along left and right side portions, respectively, of the display. All of the functional keys are separate and spaced apart from all of the alphanumeric keys. Pressing a line select key selects a line of the display that is positioned next to and aligned with the line select key. The annunciations identify a state of the avionics interface device. First and second annunciations indicate the device is configured to communicate with a Controller-Pilot Data Link Communications system and an Aircraft Communications Addressing and Reporting System, respectively. A third annunciation indicates the device has encountered a failure.