19. A system, comprising: an audio device configured to receive an audio input from a user; a speech recognition processor in communication with the audio device, the speech recognition processor configured to recognize at least one voice command from the audio input; and an avionic system separated from the speech recognition processor and in communication with the speech recognition processor, the avionic system configured to: determine whether the at least one voice command is valid; determine whether the at least one voice command includes a safety-critical command; present a preview of the at least one voice command when the at least one voice command is valid and includes a safety-critical command; execute the at least one voice command only after receiving an explicit confirmation from the user when the at least one voice command is valid and includes a safety-critical command; and execute the at least one voice command immediately when the at least one voice command is valid and does not include a safety-critical command.
19. A system, comprising: an audio device configured to receive an audio input from a user; a speech recognition processor in communication with the audio device, the speech recognition processor configured to recognize at least one voice command from the audio input; and an avionic system separated from the speech recognition processor and in communication with the speech recognition processor, the avionic system configured to: determine whether the at least one voice command is valid; determine whether the at least one voice command includes a safety-critical command; present a preview of the at least one voice command when the at least one voice command is valid and includes a safety-critical command; execute the at least one voice command only after receiving an explicit confirmation from the user when the at least one voice command is valid and includes a safety-critical command; and execute the at least one voice command immediately when the at least one voice command is valid and does not include a safety-critical command. 20. The system of claim 19 , wherein the at least one voice command includes at least one of: a flight display control command, a flight management system control command, a chart recall command, a radio tuning command, a format change command, a checklist entry command, an aircraft system command, a switch control command, a menu control command, a natural language command, a macro command, and a contextual command.