It's clear that when its in CO's best interest--delays, overbookings, cancelations--to allow you to standby to another city the odds increase of it happenning. Apparently, if you also have the charming smile of fctsty ( ) that could also have a bearing on your case.

My experience suggests that the GA is the most likely one to honor the request. In fact, I once got in awful delays in ewr trying to get to DCA and I went the customer service counter and they could nothing. I then went to the gate of ( I think of bwi flight ) and that GA got me on no hassles.