Spirit Airlines Inc SAVE is facing turbulent skies ahead. While the broader airline industry is flying high, Spirit's financial woes are pushing it toward a potential bankruptcy. With debt piling up and its stock plummeting, the budget carrier is now fast-tracking the retirement of its Airbus A319 fleet. Investors are left wondering: Can Spirit pull off a turnaround, or is this the beginning of the end? What Happened? Spirit Airlines is expediting the retirement of its Airbus A319 fleet, with final flights ...