JetBlue travel credits can be applied to:
Airfare and taxes on JetBlue-operated flights booked through jetblue.com
The air portion of a JetBlue Vacations package
Change fees for Blue Basic fares, and any applicable increase in airfare when changing a booking.
Travel credits cannot be applied to:
"Extras" – Travel credits may never be used to cover fees for the following items: Checked bags, same-day switches, advance seat selection for Blue Basic or other seat fees, Even More® Space, priority security, pets, unaccompanied minors, service fees (including phone and GDS bookings and changes), etc.
Bookings on partner airlines
Non-air portion of a JetBlue Vacations package
Online travel sites other than jetblue.com or the JetBlue app