JetBlue just emailed me about a promotion code for 20% off domestic flights on JetBlue for travel September 3rd to December 18th if travel is booked by tomorrow, August 27th! The promo code is FALL2014. This is a pretty wide travel range but it does exclude travel around Thanksgiving and flights cannot be on a Friday or Sunday. 

Here is a link to the promotion page.

20% Off JetBlue Flights

Here are the full terms of the promotion code

Offer details:

• Promo code: FALL2014
• Offer: 20% off base fare for domestic U.S. travel only
• Roundtrip purchase required
• Book by 8/27/14
• Travel 9/3 – 12/18/14
• Blackout dates:
  • 10/13, 11/21 – 12/1/14 for all plus Newark 
  • 11/1 – 11/8/14 for Newark only
• Valid for travel Mon. – Thurs. and Sat. only (both outbound and return dates must fall within offer period in order for discount to apply)
• Not valid for a Mint seat

 Here’s how to book using the promo code:

• Promo codes can only be redeemed online at jetblue.com/promo.
• Search flights within travel dates listed above.
• Enter code in promo code field exactly as it appears (case sensitive).
• You must select flights in order for discount to appear. Once selected you will see the discount amount displayed in the itinerary subtotal on the bottom right side of the flights page.