I may be talking only for myself now, but I would definitely want "next air date" to ALWAYS be in the future or "today". Next air date can not be "yesterday" according to my logic. At a glance I would want to know when the next episode is coming out. It's unlikely that I will remember to always cross off the episodes I've watched, so I just want to fire up Series Finale and immediately see what show is airing today or soon, whether I've crossed off the past episodes or not.