The biggest issue with SK (and actually a lot of airlines) is that the agents do not reissue the ticket but send it to the ticketing queue. And often enough, I have seen the backend mess it up and not issue the ticket in time before the ticketing deadline or missing some information like the updated FOP - but instead of reaching out, they just drop the ball and let the ticketing deadline expire. What so far worked for me: Call in the morning, and make sure to push the agent who does the rebooking to put the ticketing on the priority queue. Yes, it does exist. Always ask for the ticketing deadline, and if you have not received the new ticket by 4pm same day or at least 3 hours before the ticketing deadline, call in and insist they fix it - like NOW.