The LAN segments are MIA-EZE and EZE-SCL-JFK. For 4M 4521, AA was able to automatically assign row 2. I haven't attempted manipulating that assignment to see if the problem exists there as well. For LA 532, AA could not select seats. When I attempt to use lan.com to select a seat, every seat I select gives the usual circle but then returns a message that the seat has just been reserved by someone else, try again. Repeatedly does this no matter what. Any ideas what I can do? Do I have to stoop to calling LAN?