<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by keithguy:
Skipping the last leg would be hidden-city ticketing, which is against the contract of carriage. Whether AA will notice or care is another matter though.</font>
doesn't matter whether they "care" or not because they have no way to enforce the terms of the contract that try to make you board a plane ex-DFW, and they know they would be laughed out of court for trying...
at any rate, they have no way for their systems to notice or care. [unless, as was pointed out, you're dumb enough to try to short-check luggage].