Originally Posted by
mahasamatman
These reponses are contradictory. If you can do it on the app, you don't have to be at the airport.
And related to the first answer (where you say "don't check in"), if you've already checked in (at T-24), have you lost your chance?
You are right, sorry I wasn't entirely clear.
If you have already checked in, I don't believe you can change your flight on the app or at the kiosk, however I am saying this with about 95% certainty because I havent done it in a while. You simply need to go to the Guest Assistance desk (which can be painfully slow sometimes). Hopefully someone can clarify. If not, I'll do it this week and let you know for sure.
If you haven't checked in, you can do it on the app or kiosk, within 4 hours of your flight. Outside of 4 hours prior, you have to see an agent (dont get me going on how stupid this is)