To put in perspective...
Southwest just came back to the table and offered an additional 1.8 Billion dollars to get their deal done for a total cost of 2.8 Billion. That comes out to $340,000 per pilot for this deal, and that was to jump their pay up from an already high base. Scale that down and Spirit would have to come up with 476 million (and probably more considering we are starting from a much lower base) for our deal.
Southwest came up with that cash after analysts and investors have been calling for them to code share, charge for bags, etc.. and they have no first class with $17K tickets to charge. Their costs were already 40% above ours.
Remember when we were something like $46 mil apart and couldn't get it done? Southwest was 1.8 billion apart and looks like they got it done.