This is a quote from Jetblue website:
Whenever Carrier cancels or otherwise fails to operate any scheduled
flight, Carrier will, at the request of the Passenger either (i) transport the
Passenger on another of Carrier’s flights on which space is available at
no additional charge, or (ii) provide Passenger with a full refund in
accordance with Section 26 below. Except as may be provided in
Section 37 below, Carrier shall have no other liability or responsibility to
any Passenger as a result of a failure to operate any flight.