Depending on the type of fee and the amount of the ticket, the cost of a JetBlue flight change varies. For tickets under $100, the Blue and Blue Plus pricing are $75. You'll need $100 to exchange a $100 ticket for a $149.99 one. A ticket can be changed for $150 to become a $199.99 ticket, or for $200 or more. The airline's Blue Basic fare cannot be changed or cancelled. The Blue Extra fare,...