DENVER -- Discount airline JetBlue is launching a new unlimited travel pass that can save frequent fliers a lot of money on their vacations.

For $599, customers can purchase an unlimited travel pass that lets them fly for free to any of the airline's 56 international and domestic destinations as often as they like between Sept. 8 and Oct. 8.

Holders of the All-You-Can-Jet Pass will have access to every available seat on every flight with no blackout dates, according to the airline, as long as they book the flight three days before departure. If they fail to show up, they will be charged $100 and the pass will be suspended until they pay the fine.

If they need to make a change to their itinerary, there's also a fee.

Passes must be purchased by Aug. 21 or until supplies last and it includes all taxes unless flying to Puerto Rico or one of JetBlue's international destinations.

The JetBlue pass appears to be a great deal if you plan on flying across the country more than once in the month.

Travelers who have already purchased a flight on JetBlue within that travel window can convert their existing ticket into a pass.

September and October are the "dead season" for airlines with students going back to school, workers returning from summer vacations, and leisure travelers staying away from the sky, according to ABC News.

Jet Blue does fly out of Denver.