After the pandemic, Frontier Airlines has announced its latest incentive to get passengers back in the air: a $399 summer flight pass for unlimited travel.

According to Frontier’s website, the all-you-can-fly plan lets customers book “an unlimited number of flights” between May 2 and September 30.

The tempting offer has a few conditions. For instance, you shouldn’t rely on pre-planning your flights. According to Frontier’s website, you must book domestic flights the day before departure and international flights 10 days in advance.

Additionally, there are monthly “blackout periods” during which flights are not eligible for the “GoWild!” pass.

In addition, you won’t be able to earn miles or status on the flights you book with the pass because you won’t be able to purchase add-ons like seat selection or bags separately. Additionally, according to Frontier’s website, in addition to the cost of the pass itself, you will be required to pay “$0.01 in airfare plus applicable taxes, fees, and charges at the time of booking.”

Pass holders must also be citizens of the United States.

The summer pass for 2023 is a follow-up to a similar venture that Frontier launched last year, when it offered an unlimited year-long pass for $599. According to the airline’s website, the annual pass will again be available this year for $1,299.