Description: You must first purchased a ticket for a flight that provides Mint service you want to upgrade to mInt on JetBlue .You can use the JetBlue app or website to do this . Once you have a ticket you can visit the airport check in desk or get in touch with JetBlue customer support to seek an upgrade to mint .it is advisable to seek upgrade as early as possible because they are subject to availability . You can upgrade if there are seats available in the Mint cabin by paying the different in price between your original ticket and the Mint fare .