Dear farecast, flightcaster, or any other travel prediction related start-up. You would carve yourself out quite a niche if you added a feature which helped predict for a given flight how many upgrades would be available a week, a day, 2 hours, and at boarding time. In fact, I'm half tempted to do this myself, but please build it for me. In exchange I'll send you Pez, lots of gratitude, and buy you a Whisky the next time you're in SF (and face it, you're probably already here).