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Voice over. O.S. is for a character that is presumably physically present in the depicted setting but not in the shot and their voice is being heard by another character. VO is for characters tha...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/30049 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/30049 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Voice over. O.S. is for a character that is presumably physically present in the depicted setting but not in the shot and their voice is being heard by _another character_. VO is for characters that are NOT present in the depicted setting; like people on the phone (if you don't cut to them or split screen them) (or other communications device), or it is usual for narrators providing information or in cases where there is no _other character_ to hear them. So the AI communicates through a speaker to characters, there is no AI standing off to the left somewhere; and for that we use VO. In your outside the ship establishing shot, your characters are NOT OS, they are in the shot! Just inside that ship. So VO is the right choice there, too.