21-day advance purchase required. Purchase from April 12 through May 3, 2021, 11:59 p.m. Central Time. Continental U.S., San Juan, Puerto Rico, and international travel valid May 3 through May 26, 2021 and September 7 through November 5, 2021. Travel continental U.S. to/from Hawaii valid May 3 through May 26, 2021 and August 9 through November 5, 2021.