I think they just added international travel?! The website copy now reads:
- Search & Book on FlyFrontier.com the day before flight departure for domestic travel and starting 10 days before flight departure for international travel. Your pass will be valid for one year beginning May 2, 2023. For each flight, you'll pay $0.01 in airfare plus applicable taxes, fees, and charges at the time of booking. When you book, you can also purchase options like bags, seats, and other ancillary products for each flight to customize your travel.