Overheard a passenger last flight say he made several return flights from Las Vegas so to maximize his luck? That is how he said it. He made an original return date / earlier return date / and late return depending in his bankroll's durability. The point I had not considered was the no penalty for cancellation fee and he used a combo of cash and points etc. not trying to start a debate or anything but had not thought of that before...take advantage of low rates vs. high rates available when wanting to change on the fly.