There's only so much you can learn about your upcoming Thanksgiving Holiday air travel via delay times.  A much more accurate measurement is the Flight Misery Map.

You can track the misery level of different airports across the country as you track delays and cancellations due to weather on the Flight Aware Misery Map.  Track the misery over the past 48 hours as the year's first major winter storm system moves across the country.  If you're not traveling this Thanksgiving, the Misery Map is still a good gauge to know exactly how cranky your in-laws will be when their flight arrives.