I don't see MVD-EZE on your IB list. Is it true this is not a 5th Freedom flight and thus cannot be booked by non-IB originating passengers? Both the Iberia and ITN sites appear price it and accept bookings, though I have yet to actually confirm and pay for such a booking.
I was hoping to use this while in South America to pick up IB as one of my 5 oneworld carriers in the 100K promo. Otherwise, I will use one of the shorter flights ex-Miami later in the month when I do my CX (YVR-JFK) and AA (JFK-MIA) sectors.