freggy

I'm in the final planning of my first Aone5.
I was planning to fly HKG-LAX-MIA-EZE, all F-class flights, but BA just let me know that I can only have one transfer in North America, and this routing has obvious Two.
I'm planning to have some extra North america segments afterwards.

So they suggest to fly HKG-LAX-EZE, with the LAX-EZE 2-class flight with LAN with 2 stops.

I would prefer to go HKG-JFK-EZE but EF shows F4A0 and J7D0 for the two flights.

So now I would like to ask, how good/bad is the LAX-EZE flight, and what are my changes that there will be availabilty on the HKG-JFK-EZE routing.
Seatsmaps from both flights shows wide open.
Or is there any other routing possible?

I'll fly HKG-NRT-HKG on 10/22, and need to be in EZE on 10/24