I have a chance to fly to Santiago on either AA, CO, or LanChile in First Class. Has anyone flown to the southern hemisphere on any of these, and how is the quality of First Class on these. Our final destination is Mendoza, Argentina. Almost 29 hours away. Sleeper seats are a must for me (6'4" and then spending 2.5 weeks on a mountain), but I sort of doubt AA or CO has equipment with that sort of arrangement. Any tips?