My husband's stuck in SF right now -- AA has a strict yes/no policy -- they don't care about percentages of particulate apparently, even if there is a trace they don't fly. So he was supposed to go SFO-DFW-EZE today, AA changed his flights to tomorrow no charge, but after that we'll see -- there's no rain in sight so I suspect he won't be flying tomorrow either, and I'm sure at some point AA will make him fly to DFW in case there is a last minute change, but that would suck since I think at a certain point he also has to pay the hotels -- after the volcano in Iceland a few years back a lot of airlines stopped paying accommodations because these things fall under "acts of nature".
Also on the news last night they were saying that a 3rd eruption is highly likely, so if that happens I'd assume at least another day's delay, unless the wind changes direction or there's some rainfall.
AA / Air France / KLM / AC among others cancelled. No flights from Aus/NZ direction either. There may be some Aerolineas flights to Brasil and then can go on from there -- supposedly some of the planes were landing in Sao Pablo yesterday -- which is kind of like saying ok we can't land in Dallas so we're just going to leave you here in NYC and you can figure out your own way home!
The problem is that a lot of the international flgihts use planes that are just way too large to land at most airports in Argentina, so they have to go to other int'l destinations ie Sao Pablo, none of which are close by, therefore some airlines just opt not to fly at all unless they know there's an extremely high possibility of landing at EZE.