Changes, Cancellations, and Standby JetBlue. WebJetBlue customers may make a confirmed same-day switch for a flat fee of $75 (no fare.

Changes, Cancellations, and Standby JetBlue
Changes, Cancellations, and Standby JetBlue from i.pinimg.com

WebWait at the gate of the flight that you have signed up for, and be ready with your ticket and identification when they begin allowing standby travelers.