The Friday File: The busiest airport travel day of 2015 was August 7^th, with 2.91 million sold seats. The day before Thanksgiving was the 121^st busiest airport travel day of 2015. That said, November 29^th, the Sunday after Thanksgiving will be the second busiest day of the year with 2.905 million sold seats. Of the top 50 busiest days, all but two are in June, July or August.