JetBlue and Delta Air Lines have round trip airfares travelling to and from Boston (BOS) and Ft Lauderdale (FLL) for $ 137, nonstop. These are basic economy fares, a restricted-type fare. On Delta you may have a personal item and a carry-on bag. On JetBlue you may only have a personal item. There is no seat selection and no change. If you are travelling with children on JetBlue, you will be seated together as per JetBlue’s policy. Delta will only decide this on a case-by-case basis.