I had a discounted internet (not e saver)fare BOS-BWI. On my return last night I was able to go standby BWI-PHL-BOS instead of BWI-BOS. I left an hour earlier but arrived a half hour later than the original routing. I did not have to pay any change fees and both the phone agent and gate agents easily accomodated me.

Why did I bother?
Can you say triple and misc bonuses?