Originally Posted by
craigsnyc
The agent is correct. If your bucket isn't available, stand-by is the only option.
Agent is not correct. One can SDC into a higher fare class by paying the upfare and SDC fee (if applicable). This can not be done at the kiosk/app/online though - an agent has to do it. So there is another SDC option, assuming there is availability on the flight somewhere.
Standby is also an option, but was correctly stated that this has to be done at the airport.