Spirit Airlines plans to furlough 1,800 flight attendants before the end of the year, the cash-strapped budget carrier said Monday. Spirit filed for Chapter 11 bankruptcy protection last month and subsequently announced that it planned to suspend operations in about a dozen U.S. cities beginning in October. The union that represents the airline’s flight attendants said Monday that Spirit would seek candidates willing to take six month or one year voluntary furloughs starting Nov. 1 before moving forward with involuntary furloughs based on seniority effective Dec. 1. The company’s cost-cutting efforts continued after it emerged from bankruptcy protection in March, including plans to furlough about 270 pilots and downgrade some 140 captains to first officers in the coming months. But buyout attempts from budget rivals like JetBlue and Frontier were unsuccessful both before and during Spirt’s first bankruptcy process.