You can directly buy a Jetblue mint flight. Or, if you have already bought a basic fare, you can go for an upgrade request with a minimal extra about.
Steps to book Jetblue mint flight online:
First, you need to visit the official site of JetBlue airlines.
Then, you need to choose the type of trip you would like to go for. For example, if you wish to book your one-way, multi-city, or round-trip.
Then, you need to provide the travel details, such as the destination and departure city. Also, you need to provide the desired travel dates as well.
Now, enter the number of passengers that you are making a booking for.
After that, click on the search button, and you will get the list of flights available for you as per your preferences.
Now, you can choose Mint as your travel class.
Then, provide all the details of the travelers. And review before you confirm to avoid mistakes.
Make the payment, and you are done.
In the end, do not forget to check the confirmation mail so that you become sure about your
JetBlue First Class booking.
Source:
https://cancellationflights.com/blog/how-to-book-first-class-flights-on-jetblue/