How would you like to fly across the United States in a month and spend only $600 doing it?

JetBlue is offering an unusual promotion in the downturn. Basically, this is the way it works: if you buy a JetBlue all-you-can-jet pass for $599 between now and August 21st you can fly anywhere the airline goes virtually as often as you'd like from September 8 to October 8, and there are no blackout dates.

However, flights must be booked no later than 11:59 a.m. three days before the flight's scheduled departure.

So, is it worth it? This is what the publication SmartMoney had to say about the airline's deal:

"Say you're tempted to buy an "All You Can Jet" pass to book a getaway to the Dominican Republic. Round-trip flights from Washington, D.C., to Santo Domingo could cost you around $445 with tax if you booked a weeklong trip now. Using the pass, you could also take a weekend trip to Houston that might otherwise cost about $348 on JetBlue. You'd still pay taxes on the international flight - so you'd spend about $746 on travel that would have cost you $793. Depending on where you're flying from, you might need to take three trips within that month to really make the pass an attractive bargain."

Click below to read SmartMoney's entire article.