I just booked my flight SFO-IAD-EZE and on the return SCL-EZE-IAD-SFO. The SCL-EZE is with Lan. The connection should give me two hours connecting at EZE arriving at 7:05PM and on UA 846 on 4/12 departing at 9:05pm. How are the international connections at EZE? I know that LAN and UA have a luggage agreement, but their systems do not talk to each other.

Any advise as to how to transfer fast?

Thanks