Another newbie set of questions, last flights with them were 6-7 years ago.

I’ll fly with them GRU-SDU // AEP-SCL-CJC // CJC-SCL. I have luggage, value a free seat next to me for privacy and want to minimise queue waiting times as much as possible. I was thinking about buying these flights in Premium Economy, but wanted to know whether premium economy gives access to fast lanes at security at the above airports. How about priority lines at luggage check-in?

Also, is there any catering, at least on the longer flights to and from Santiago?

Lastly, when flying AEP-SCL-CJC, is luggage checked through or do I have to retrieve it in Santiago and check it in again? Does that involve a walk from the international arrivals to domestic check-in, or is there a domestic re-check-in counter right after customs in the international arrivals area (like they have in the US)?

Thanks.