copyright provides flexible cancellation options depending on the fare type. Passengers with Blue, Blue Plus, Blue Extra, and Mint fares can cancel their flights without a cancellation fee, though any fare difference may apply when rebooking. However, Blue Basic fares are non-refundable and may incur charges if canceled.
Refundable tickets qualify for a full refund to the original ... https://americanairtravel.com/jetblue-airlines-flight-cancellation-and-refund-policy/