This is a bargain worth noting. I have never seen anything quite like it in the past, and it may not be repeated. Anyone with moderate travel coming up during the month of September and early October should look into this deal.
Here is the text from a JetBlue ad with live links to appropriate pages. There is fine print, but not too much. Flights can be canceled without fees as long as they are canceled three days prior to scheduled departure.
Enjoy unlimited travel with our All-You-Can-Jet Pass! For just $599* you can take JetBlue anywhere you like, as often as you like, from September 8 to October 8, 2009. Use your All-You-Can-Jet Pass for business, for pleasure, to visit your favorite cities or to meet with a client. You might as well just do it all! With more than 50 cities to choose from, and for just $599, it’s a deal you can’t pass up.
About the Pass
* $599 for a month of unlimited travel, any available seat
• Domestic taxes and fees included
• International and Puerto Rico taxes and fees not included* On sale through Friday, August 21, 2009, or while supplies last
* Travel Dates: Tuesday, September 8, 2009 through Thursday, October 8, 2009
* Each flight must be booked no later than 11:59 p.m. MDT three days prior to the flight’s scheduled departure.
* Nonrefundable/nontransferable/no name changes permitted
* Customers who already have a flight booked during the pass travel period can pay the difference to upgrade to the pass by calling 1-800-JETBLUE (538-2583), prompt 4.
* Each All-You-Can-Jet Pass is eligible for 35 TrueBlue points. Flights booked on the pass are not available for additional TrueBlue points.To purchase an All-You-Can-Jet Pass:
Call 1-800-JETBLUE (538-2583), option 4. You do not have to be a TrueBlue member at the time of purchase, but a TrueBlue number is required to book all flights.To join TrueBlue, click here; it’s free.
To book flights with your All-You-Can-Jet Pass:* Before calling to reserve your flight, please visit jetblue.com to check availability and select flight times.
* Call 1-800-JETBLUE (538-2583), prompt 4.
* Provide your pass number which is your original reservation number.
* Provide your TrueBlue number.
* You may only book one flight per city per day; if a violation of this policy is found, JetBlue will honor only the last booking made and cancel the customer’s other bookings from that city on that day.
* Each flight must be booked no later than 11:59 p.m. MDT three days prior to the flight’s scheduled departure.
* You can change/cancel flights for no fee with three (3) or more days notice; changes or cancellations to flight bookings made after 11:59 p.m. MDT three days prior to the flight’s scheduled departure will be charged standard JetBlue change/cancel fees.To change or cancel All-You-Can-Jet Pass travel:
* Greater than three (3) days before a flight: $0 change/cancellation fees
* Less than three (3) days before a flight: JetBlue’s standard change/cancel fees applyIn the case of a no-show, the customer’s pass will be placed on hold, any reserved pass flights will be canceled, and no new flight segments wil be able to be booked until the customer pays a $100 no-show penalty.
*Other important restrictions apply. For complete details, please read the Full Terms and Conditions available for download from the JetBlue website.

Charlie Leocha is the President of Travelers United. He has been working in Washington, DC, for the past 14 years with Congress, the Department of Transportation, and industry stakeholders on travel issues. He was the first consumer representative to the Advisory Committee for Aviation Consumer Protections appointed by the Secretary of Transportation from 2012 through 2018.