Originally Posted by
crazy8534
Are you flying CE?
If so you should be eligible for a free change on the day to a later flight (provided there is availability) which you can do on the app if your meeting runs over.
I would just add that I have had no problems doing this even when I was checked in for an earlier flight.
And also in ET too, just not the basic fare. More details in the FCOD thread, there are other factors such as it can't be a redemption fare (ET or CE).