Key TakeawaysSpirit Airlines warned that its second-quarter loss would be more than expected, and revenue would fall short of its previous outlook.The company blamed the worse numbers on less-than-anticipated non-ticket revenue.The news sent Spirit Airlines shares to an all-time low. Shares of Spirit Airlines (SAVE) fell to an all-time low Wednesday, a day after the discount carrier warned that its second-quarter loss and revenue would be worse than it had previously expected because non-ticket income came ...