Originally Posted by
UA Insider
Sorry about the inconvenience. The site is currently down and will be back up later this afternoon. As noted this will affect the mobile app as well.
I note UA pushed an update to the iPhone/iPad application. After updating, I discovered I can log in to either my CO or UA accounts from the same app. I would guess this is deliberate, as we're being left with UA Mileage Plus using CO account numbers.