As noted by others, if your arrival flight is delayed then you're out of luck, although if the onward flight is on the same ticket the airline will put you on another flight.
AR (Aerolineas Retrasadas) used to be routinely late, especially on "non-tourist" routes, however in the last few years (with competition) they have improved a great deal, so I think that their poor reputation is no longer deserved. My personal experience - the average delay a decade or so ago was 46 minutes; the average…

