Originally Posted by
FrequentFlyerYYZ
I just gave the system a bit of a stress test - bought a Lat TATL ticket, moved it five times and then had to cancel it outright (all thanks to a disorganized client).
This could be a fun exercise - find a TATL or TPAC with R0 that is at least a month or two out, buy a lat ticket and get on the waitlist, wait until a day or so before the T+ window and see if AC releases an R seat to clear your upgrade before the T+ window. Cancel your ticket and get a refund once your curiosity is satisfied.