In the olden days (early to mid 90's - yikes, I'm OLD, I remember a decade ago!

) Delta used to fly an Atlanta - Albany - Portland Maine, and Bradley - Palm Beach - FLL - Bradley, and FLL-MIA-YYZ. The best part was getting 1,000 miles (yikes, I even remember when the Delta Frequent Flyer program awarded 1,000 miles per segment) for the FLL-MIA, I was a mileage who.. before this site existed, I booked FLL-MIA, MIA-ATL, ATL-whereever I was going. Ah, the days of more time than money.
Sorry, a little off-topic. I supposed jetBlue could do a JFK-Wilmington NC - Savannah - JFK. It wouldn't work in markets where other carriers fly nonstop and would match the fare but it would work in markets where there is limited service such as Wilmington NC, Savannah, and some Florida panhandle places. I think Air Tran exhausted the Florida Panhandle, if Air Tran couldn't make it work out of Atlanta jetBlue sure isn't going to make it work out of NYC.