Spirit Airlines announced that it will sell multiple aircraft and lay off workers as the beleaguered carrier tries to raise cash. In a filing on Thursday with the Securities and Exchange Commission (SEC), the ultra-low-cost carrier, whose plan to merge with JetBlue was blocked by regulators this year, said it identified approximately $80 million in annualized cost reductions that it plans to implement next year. These cost reductions will primarily result from "a reduction in workforce commensurate with the ...