I had a delayed flight out of MIA the other day and missed my connection by 20 minutes. Before we had landed, the app showed I had been rebooked on a later flight (MCO-PHL instead of MCO-CLT / CLT-PHL) do must have updated during the flight.
Very handy not having to try and get rebooked on the ground (would have claimed original routing credit anyway so wasn't bothered about the flight I was now on. As a bonus, the MCO-PHL flight was oversold so volunteered to go on the next flight and got $500 for it)