This is a hell of a deal. All JetBlue routes are available for a mere $31 one-way for travel on October 31 after noon (in whatever time zone you might be). With taxes that comes out to around $41 all-in.
I’m actually flying from JFK to TPA on the evening of October 31 and booked Delta for $99. While I’ll probably end up in first class and have lounge access, I would have taken JetBlue for $41 in a heartbeat.
I even see a New York to Long Beach flight with availability at this price!