Trivia: JetBlue says this day is its most important revenue day of the year. What is it?

What's the most profitable revenue day of the year for JetBlue Airways?

Airline executives gave the answers today on the airline's third quarter earnings conference call. Do you know what the day is? Leave your guesses in the comments section. I don't have a prize today, but if you're right, you'll win my respect. 

For those interested in such information, JetBlue recorded a quarterly profit of $79 million.