I cancelled a MCO-BOS flight and used the credit to book a BOS-JFK flight (less expensive ticket) and I still have the remaining credit available.
It does seem like there are no restrictions on booking more expensive/cheaper tickets, or different routes. I would imagine you can also use the credit for purchasing tickets for others - as it simply is like making a new booking.
Best is to set up a trueblue account so when you cancle a flight, they just credit your trueblue account so it's kindda like a bank account but with jet blue credits, when all the changes I made and fare reduction, i have alot of credits on file... I use it for myself and use it for other people traveling with me... so I don't see any restrictions on them interms of who can use the credits.
Location: on my way to (CFE) Clermont-Ferrand, Auvergne, France from New York City
Programs: joined OneWorld(QF,BA,AA) Skyteam(AF,DL) formerly spoiled silly with: TrueBlue,Elevate,Velocity
Posts: 1,753
I had a real difficult time cancelling a flight recently.
I have cancelled flights before and recently used those credits to book a series of other flights. When it came time to unfortunately cancel a flight this past Monday I couldn't do it online... the customer service rep told me since I used my jet blue credit and not a credit card I couldn't modify or cancel my flight online. Not that the $5 dollar difference really matter in this case but I was trying to tell her that before any money appeared in my jet blue credit I used my jet blue credit card to pay for the tickets.
I booked IAD-OAK last summer, cancelled 3-4 weeks later, and used the credit to book a roundtrip ROC-JFK for a friend this summer. No problems at all. Only issue was having to call the reservations line rather than being able to book online.