Well is not like that but is clase hehehe.

LAN's upgrade system is based on 2 things. The first and most import is your status...and i will say that is about 90% based on status. The other 10% is the time when you ask for it. Let me explain to you.

When you ask for an upgrade you will see a list of all People asking for it. As soon as you ask for it, higher you get to that list but in your category. So lets say we have 2 seats on J, you have a premium Silver and ask for it 48 hours before the fly and all the other People asking for the upgrade are on Silver or Just Premium.... And even if you check in the airport that you are still on first place... Well a Comodoro could just wall to the check in 2 hours before the fly, the same People on the counter will ask if he wants the upgrade and all ready he gets the first priority, and if he is with someone on the same booking well that person gets the 2nd seat.

Is bad if you are not Black or Comodoros, but when you are one, is son sweet hehehhe