Originally Posted by
chris63
No, on the actual day of travel, the issuer has no input, only LH can make the change & it might happen in FCT, makes zero difference to LH, except costs them less in consumption at FCT, certainly no harm in asking.
Totally agreed. LH alone can modify the ticket on the day of travel or even 24 hours before. The question is, are they willing to do it? And also it might be a question of availability. If the later flight has I class available at the moment it may be easier to do.