Old Oct 26, 12, 11:00 am
  #4  
CTcowboy
 
Join Date: Dec 2011
Location: San Francisco
Programs: Mileage Plus
Posts: 19
In most cases I've found that I can go online or through the mobile app to chose my seat after receiving an upgrade. This is certainly the case for upgrades that happen before the 24 hour period. I haven't tried it for when I get upgraded at the gate, but often at that point you don't have a choice anyway.
CTcowboy is offline