We kick off our Thanksgiving 2021 coverage focused on Friday's flying. Travel behaviors are liable to have changed since last year, though Friday figures to be the third busiest "go" day if 2020's patterns hold (Sunday the 21st and Wednesday the 24th figure to be the second busiest and busiest "go" days, respectively); return traffic consolidates around Sunday the the 28th, which should be the busiest day of the entire period.