Unlimited prepaid airfare comes back

Bargain airfares have been abundant this year and rarely make news anymore, but it was fairly easy for JetBlue Airways to grab headlines last week with its very generous “all-you-can-jet pass.” The question is: Does this prepaid pass make sense for you?

If you have no plans or desire to travel between Sept. 8 and Oct. 8, you are not likely to benefit from the low-cost carrier’s offer. On the other hand, if you have several trips in mind — even if you’ve already bought tickets for some of them — the new $599 airpass can be your best friend for a month. Although it went on sale Wednesday, demand has already exceeded JetBlue’s expectations…