Unrelated to the thread's primary issue, but: do you mean that for $244 you were able to change from a flex fare to business class, on a multi-segment trip including YYZ-SFO? How is it possible that it could be that cheap? Or am I mis-understanding what you've done?

There are lots of flights where I would be delighted to turn a flex fare into business class for $244 but I've always assumed the price differential would be far greater.