Originally Posted by exerda
If it turns into an irregular ops day, all bets are off, and UA will probably gladly move you to another flight with the understanding that you'll be responsible to get to your originally-ticketed destination (SFO) once they get you to OAK.
Exactly. So the trick is to find something wrong with the flight you're on. This happened to me once when ticketed on SFO-BWI.
Me (to agent working IAD flight): "Can I get on this flight?"
Agent: "Sorry, Sir, your ticket is to BWI."
Me: "Ok, thanks."
(15 minutes later, BWI is posted as delayed)
Me (to the same agent): "Now my Baltimore flight is delayed, and I really need to get back East. Can I get on this flight now?"
Agent (verifies delayed status of BWI flight): "Window or aisle, Sir?"