Frontier Airlines proposes merging with bankrupt Spirit -- again. Spirit says no - Frontier Airlines is trying to merge with Spirit -- again - Spirit's woes reveal the dismal state of America's budget airlines - What Spirit's Bankruptcy Means for US Holiday Travel - Budget airline Spirit files for bankruptcy - Halloween costume chain Spirit bet on the pop-up model and won - From Southwest to Spirit, budget airlines are in a tailspin - With new changes at Southwest and Spirit, it's getting harder to tell the airline brands apart - JetBlue and Spirit appeal judge's ruling that blocks their proposed merger