Spirit went public in 2006 at $26.00 per share, implying a $3.8bn market cap [1]. That’s about $40.50 ($5.9bn) today [2].
This deal is at $37.25 per share, implying a $4.7bn market cap and $8.3bn enterprise value [3]. Spirit’s shareholders got hosed; value was transferred to its lenders.
Not particularly; a number of Spirit's business units have been running at a loss for over a decade. Another way to put it is that Spirit's shareholders got hosed by Spirit's management.
But the shareholders collectively outrank the company management in a public company. So it is their failure as well, and so they have to take the L on this too.
If you're gonna invest in an aircraft builder that sometimes forgets to put the bolts in, I think only losing 8% is a pretty good deal.