Delta Airlines has matched American’s fly two flights between BOS or NYC and California or Florida and get one ticket to anywhere free offer. Sort of. Delta has excluded “T” fare tickets from this offer—the least expensive class of tickets. So, you’ve got to ask yourself whether it’s worth the $100 or so premium to buy a more expensive ticket just to qualify. That’s for you to decide. Keep this in mind, though: tickets must be booked in the elusive “E” class and, as Delta mentions, some markets may not have any tickets available ever.
In any case, I think it makes much more sense for Delta and Song to offer this promotion than American. Song has a comparable product to JetBlue and is still introducing people to the concept. However, when a company is trying to push it’s low fare option, it seems a bit disingenuous to disqualify low fares from the offer, doesn’t it?