Thanks, Darren. I looked there. It's not one of the airlines listed on the title page, and "Patagonia" didn't show up in a search there. Must be a very un-used airline.

San1K, Explora was indeed the one. I was kinda afraid of that from what I could find on-line. I found one web site with some spectacular pictures, and a lot of hype from travel agents, but not much else. I appreciate the comments - it's a long way to go for expensive ho-hum. We don't normally even think about SA - anything you think we're missing in Lan Chile territory (besides a mileage run?)