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…