Quick follow up to my previous post: I talked again to TK and the agent said they would only be able to make changes to the ticket within 24 hours of departure (including change of travel dates). This is, if I would like to travel tomorrow instead of December they would be able to change the ticket for tomorrow. I am aware airlines take control of ticket within 24h but I have never heard that they can take over the ticket if the passenger wants to travel the next day (even if the original travel date is months away). Does this sound correct?