Hi All - I read some of the prior posts on this topic and I'm a bit dense so I'm still confused.

I'll be arriving in EZE on UA and then have a 3hour layover before my connection on LAN to SCL.

1. It sounds like I can stay Airside
2. It sounds like I may be able to avoid immigration and customs
3. It sounds like I need to find a way to print out my boarding pass on Lan.com prior to arriving in EZE

Is that all accurate? Also, does anyone know if UA will agree to interline my bag all the way through? I'm actually doing LAX-IAD-EZE-SCL

Thanks!