For those of you checking in at Ezeiza for a flight transferred from AEP, they are leaving from a makeshift gate area just to the right of international arrivals in Terminal A (not Terminal B normally used by Aerolineas).

Buy your food / drinks elsewhere -- there was one lonely food cart past security with the most expensive water I saw in Argentina, and not much else.

Also, these flights arrive by bus into a makeshift baggage claim area in Terminal B. All flights share the same belt and the room gets very crowded.