Originally Posted by
astroflyer
You should not get SDC for free unless you have UA gold status. You may occasionally get lucky with an agent on the phone or at the airport, but don't plan on it.
I don't think I got lucky. More than 1 agent tried to charge me but none seem to have succeeded. Others have reported the same thing - the UA system does not charge *G for SDC. My only problem was signing on to UA first before doing an SDC.