Join Date: Sep 2006
Location: Santo Domingo, Dom. Rep. / Washington, DC
Programs: AA PPro/DL PLT, PPass, Marriott / Hilton Gold, JetBlue Mosaic, Hertz Presidents Circle, Amex Plat
Posts: 4,787
I've been able to change my seat before receiving the boarding pass. Go to your reservation around T-28, T-29, and if the status shows "Checked in" the system will let you start a new check-in process where you can select a different seat.