I can't seem to ever recall having gotten one of these although I have had numerous domestic portions of UG not clear while the BF portions have.
Email says this:
Waitlist Expired for Confirmation XXXXXX
Unfortunately, we cannot confirm your request for an upgrade on Cleveland, OH (CLE) to New York/Newark, NJ (EWR - Liberty). You will be automatically added to the upgrade standby list when you check in for your flight. After you have checked in, be sure to go to
http://pda.continental.com/info, where you can view real-time upgrade standby lists, and more.
then weirdly it also adds.....
Unfortunately, we cannot confirm your request for an upgrade on Los Angeles, CA (LAX) to New York/Newark, NJ (EWR - Liberty) prior to your arrival to the airport. You will be automatically added to the upgrade standby list when you check in for your flight. After you have checked in, be sure to go to
http://pda.continental.com/info, where you can view real-time upgrade standby lists, and more.
........even though I have no scheduled or past flying LAX EWR. *shrugs*