it looks visa discount air is no longer allowing fares less than $100 from jetblue and i see the below message when i tried to book a ticket
Tickets are non-refundable, once purchased, and cannot be transferred to a different person.
An airline imposed fee of $70.00 applies for itinerary changes plus any fare difference if you change to a more expensive itinerary.
i don't know how it works if you are mosaic.