JetBlue, American Airlines and Travelocity have round trip airfares travelling to and from New York (JFK) and Miami (MIA) for $ 99, nonstop. These are basic economy fares, a restricted-type fare. On JetBlue, you’re only allowed a personal item. On American allows a personal item and a carry-on bag. There is no seat selection and no change. If you are travelling with children on American, you will be seated together. Be aware that you may or may not return with the same airline based on the availability.