To be fair, some flights *out* of a hub can have lots of open seats due to misconnects. If someone is trying to get home to MDW out of DTW, their saving grace could be the group of 8 coming from PHL that can't make it to DTW in time. Assuming no cancellations, leaving a hub affected by IRROPS is often quite easy. It's the day after IRROPS that's REALLY hard, because they have to play catch-up.