Originally Posted by jcooke
Now I remember hearing something before on the co-terminal rules but I couldnt find anything on the search. Thanks all for the info. IAD it is!
One more final question. The return we're scheduled for a 1235P return flight that gets in at 845P. The 6A bank of flights that connect at DEN/SFO/PHL would put us in alot earlier and would actually be preferable to take (its going to be an all-nighter and an earlier flight to sleep on is ^). Is there any problems trying to standby for these other than flying standby for all the flights?
-JC
No problem to do that other than the possibility of sitting at DEN, SFO or PHL all day if you can't clear the standby list on your new connection.
I would take a look at Y availability online or call UA when you get to Vegas and then make a decision on whether to risk it. Right now all the 6AM departure with connection in either DEN, SFO or PHL look good.
Besides, if you take your confirmed 12:35 PM departure, you can spend more time at the blackjack tables. 
BTW, are your tickets UA-issued or US-issued? I see that you have a US FF on your FT handle. If it's US-issued and you try to stand-by for a US-operated flight, you will have to pay a $25 fee
just to be added to the US stand-by list. If UA-issued, I believe US has to honor the fare rules of the UA ticket.
Can anyone please confirm this?