Is it our responsibility to track schedule changes especially if it might result in a missing a connecting flight? I have two back-to-back International trips in October and as such was making an extra effort to monitor these flights closely. Yesterday, I noticed that my one of my original segment had been re-scheduled for a 45 minutes delay leaving me only 28 minutes to connect to an international leg which then connects to yet another international leg. Connecting airport is MSP but 28 minutes is no joke. Called in and changed the offending flight (0845hrs) to the earlier flight (0645hrs) and there is now plenty of connection time. (Any SC in MSP) Just glad I caught the error as any issues with this trip will destroy the trip following immediately after. I thought there would be heads up from Delta to help prevent these? The staff on the line immediately see my issue and was helpful in all ways but if I had not catch this, I would have been in a world of grief and .... anger. Additionally, the trip was booked through my corporate agent. They failed to inform me either.