Thanksgiving is an infamously challenging weekend to fly, and the closing Sunday has a longstanding reputation as the most heavily traveled day of the entire year in this country. USA Today just reported that this year will be exceptionally bad (good if you are an airline) with 23.7 million passengers over the 12-day busy period surrounding Thanksgiving, up 150,000 from last year. The lightest travel day, not surprisingly, is Thanksgiving itself, while the busiest are the following Sunday and Monday with 2.4 and 2.3 million flyers respectively.