14-day advance purchase required. Purchase from December 7 through December 30, 2021, 11:59 p.m. Central Time. Continental U.S. travel valid December 21, 2021 through March 9, 2022. International, interisland Hawaii, and continental U.S. to/from Hawaii travel valid January 5 through March 9, 2022. Travel to/from San Juan, Puerto Rico valid January 10 through March 9, 2022. Continental U.S. travel blacked out December 23, 26-27, 2021 & January 2, 2022. Travel continental U.S to Hawaii blacked out February 17-20, 2022.