I ended up
Ended up booking JFK-MIA-EZE (connecting in MIA), first class, for 125K miles and seems like I got the very last seat on those planes. Smart choice?
Also, there are two flights a day from EZE to MIA, and I am currently on the earlier one. Is there a way after I ticket the itinerary that I can get myself (easily) moved onto the later flight?
Thank you.