Originally Posted by hhmorgan

Actually the United.com website on SDC says "You may stand by if seats are not available in the purchased fare class. In these cases, the same-day change fee will apply, but will not be charged unless you are assigned a seat on your alternate flight. Changes in routing are not allowed when standing by. Standby may be requested on the day of departure at an airport kiosk or with a United representative. Once you are added to the flight standby list, you can check your real-time standby status at united.com/flightstatus or on your mobile device at mobile.united.com/info."

Not sure how, but I have had the 1K desk push a GPU that was previously waitlisted to a Same-day flight. They pulled it then reapplied it. So its technically possible but maybe procedurally discouraged.

I really want to know if they waitlist you on the flight in Economy and the BF upgrades are made - will they pull from the flight standy list (note - not the upgrade standby list) to the BF seat at departure. The TLV flights are normally held to t-60 minutes before GA clearance of the Upgrade Standby List if not previously processed by a sweep. I've had only 1 instance (in 7 years) where R>1 open'd at >T-60 minutes (within airport control windows).