As others have noted, no SWUs on US.
Here's the relevant web page from UA
http://pss.united.com/web/en-US/cont...wupgrades.aspx
And, as always, search is your friend. This is the most comprehensive thread
http://www.flyertalk.com/forum/unite...nsolidated+swu
Last edited by UAPremExecflyer; Mar 13, 2012 at 4:10 pm
Reason: added SWU thread