I’ve found a couple of older posts on this, but was curious if anyone had a recent experience to share. During my anticipated RTW for next year, if I rejigger the trip, I can become Platinum with AA during our initial flight into South America. We will then be flying around South America on, among others, LAN. Putting aside for the moment the anticipated 100% mileage bonus as an AA Platinum, as OW Sapphire I should also receive priority (business class) check-in, even while flying Economy on LAN. Because becoming Platinum on the way into South America will require a somewhat roundabout flight-route (causing us to lose about half a day), I’m trying to decide if it’s worth it, particularly from the standpoint of the priority check-in (without that routing change, we will still become Platinum, just later in the trip). Two questions: First, will I receive priority check-in on LAN flights immediately after achieving OneWorld Sapphire status by flying AA? Obviously I won’t have a physical OW Sapphire card to indicate status at that point, so will I be able to get onto a business class line with my Economy ticket and have LAN look up my newly acquired status in the computer, or will that not be possible because of a lag with AA transmitting my new status to LAN? Second question, is this a real benefit—i.e., will being able to use business class check-in while flying Economy on LAN result in a material saving of check-in time at the airport? fyi, I tried to ask some of these questions to the AA and LAN desks, but did not receive helpful answers.