I needed to change a trip that was 48 hours out but the wait time for calling in was over a day because of winter weather. Trying to change it online just gave the message saying to contact reservations. They could save a lot of tine on the phone if they were better equipped to make changes via the app or web site. Twiiter DM is useful for some things but couldn't change the date of my flight since they said they weren't capable of collecting payment for the fare change (which ultimately ended up being a $4 credit lol)