I'm flying (or trying to) AEP-USH roundtrip in July. I booked in January. They keep switching my AEP departure/arrival flights to EZE, requiring me to jump through hoops to get put back on a flight into or out of AEP.

I understand AR does this quite frequently, but does anyone have any insight into why? It's really annoying. Is it something to do with slots, airplane availability...? This is mostly a rant, but I'm genuinely curious as to what business need this constant airport switching is meant to fulfill.