When you know your flight is going to be delayed 4 hours and in order to make your connection you get yourself rebooked on another one half an hour later which will only be delayed 45 mins, it is amusing to see how long the system takes to realize that you are on a different flight. I got a whole series of EasyUpdates recently on a flight that I had transferred out of several hours previously, before it switched to telling me about the flight I was actually going to be on.