Thanks for the heads up...I'm flying LAX-HND. Is yours from Seattle?
It was. I called in and got it changed to the LAX-HND flight with the same timing (the two were scheduled to arrive within 15 min of each other).
Note for others needing to make a change -- most of the reps are clueless and will tell you that they see the flight but just without availability. Just escalate it to a manager and press them on it (the manager didn't know at first either), and they'll eventually figure it out and help you make the change.