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...The other thing to mention is that JetBlue often has schedule changes, and as soon as a flight has a significant schedule change that ticket is then eligible for a refund. There is little incentive to cancel much before a day or two before the flight as a schedule change (or cancellation) will get you a refund back to your card whereas canceling earlier guarantees you credit only.
Do you know how this works if the flight subject to a significant schedule change was purchased using a travel bank credit from a different earlier cancelled flight?
In other words, is the cost of the fare that is subsequently cancelled due to a significant schedule change still refunded back to traveler or is it put back in that travelers travel bank with an expiration date equal to the date upon which those travel bank credits were first issued?