Actually checking every Monday morning is sufficient as AA's schedules are updated sometime between Sunday and Monday morning - this from my personal anal-retentive experience of booking high demand flights and upgrading as soon as they are available. There is another thread both here in the OW forum and also on the AA forum about changes for Q1 2006. Well actually this past Monday all schedules, for Q4 2005, Q1-3 2006 were all affected. This happens on a weekly basis to some extent, this past update just happened to include a lot of changes. I anticipate we will see more substantive changes more often due to AA's proactive stance with regard to micromanaging schedules from a fiscal perspective.

On a side note, if you are concerned about schedule changes, then check your reservations every Monday morning online for changes. I do this on a regular basis; perhaps not every Monday but I usually don't go more than 3 weeks without checking their status.