TFS while I don't know what J2 paid for their aircraft there are some amazing deals to be done on B733s these days. Just three years ago a recent build B733 would lease for around $300k/m. Today, the same aircraft would be around $100k/m. This primarily due to overproduction and heavy discounting of new B737-700s and A320s. Some lessors will currently agree to lower rentals over the winter or even a "pay when you fly" arrangement. I should think that, at the prices/rentals J2 are paying, their seat-mile costs will be lower than for NG aircraft and, if necessary, they could afford to park them for a while in the winter months.