The airline is battling turbulence, with no signs of a respite up ahead. The airline sector is beginning to feel a squeeze, and no one is under more pressure than Spirit Airlines (SAVE -8.31%). Shares of the discount airline lost 17.8% in July, according to data provided by S&P Global Market Intelligence, after a mid-quarter update prompted discussions about a potential bankruptcy filing. A bad situation could get worse Spirit has been flying through a lot of headwinds. The company saw its planned acquisiti ...