Originally Posted by number_6
It is targeted at midnight Dallas time (as CDT or CST), however as mentioned there is a lot of 'midnight' processing that has to be done, and it can take hours to actually be done (sometimes early, sometimes late).
Sometimes two days late. I was booking an OW award, calling each day for the flights that were due to open. Got several LAN flights then hit one where no inventory showed. Tried several times that day, still no inventory added. Didn't happen the next day, but finally on the third day it popped up. Might be significant that it was a Saturday when it should have been made avialable.
Could be a system upgrade time at LAN or some other reason they were slow to pass over inventory, but it can happen.