I just saw this on the homepage, and maybe it has already been posted here, but did not see it. I do wonder what brought this on.
link
New Checked Baggage Cutoff Time At Dallas/Fort Worth
Effective May 24, 2006, baggage departing from Dallas/Fort Worth International on American Airlines must be checked no later than 40 minutes prior to your flight's scheduled departure time. Baggage checked after this cutoff time will not be accepted.
BillJ