Does CO do regular schedule changes (i.e. on a specific date) or are they just random occurrences? I have a flight booked out for Memorial Day weekend and would prefer not to have some random happening alter my plans. So, if there is a specific day (like known schedule changes on April 15, for example), then I would know to check on my routing on that day and make any changes as necessary. If it is totally random, I guess I need to just pay attention, huh?