A Spirit Airlines aircraft undergoes operations in preparation for departure at the Austin-Bergstrom International Airport in Austin, Texas, on Feb. 12, 2024. Spirit Airlines shares closed at a fresh low on Friday ahead of a looming deadline to refinance more than $1.1 billion in debt. The airline's stock closed down roughly 3%, at less than $1.50 per share. The budget carrier had extended that deadline with credit card processor U.S. Bank to Monday, from a previous date in September. The Miramar, Florida-b ...