Ben reports that United systemwide upgrades (SWUs) can now be applied on Continental flights. For now, you have to call to request the upgrade, but within the coming days this should be available to request online.
I gave Continental a call to see if Continental SWUs could now be used on United flights and the answer was no--at least not yet.
Tomorrow, I will walk you through how to check upgrade award space on Continental Airlines so you can know exactly whether you can confirm and upgrade on the flight you want.
As a United flyer who already has six 2012 systemwide upgrades in the bank after requalifying for 1K status in May, I look forward to trying out Continental's lie-flat beds on the 777-200s. My next trip home from Germany just might be via Houston or Newark instead of Washington or Chicago...