Hexcel Corp (HXL -11.65%) stock tumbled 11.8% through 10:20 a.m. ET Thursday after reporting earnings last night.Heading into the company's Q3 report, analysts predicted the company, which manufactures carbon fiber composite materials and even entire airplane parts, would earn $0.49 per share on $501.8 million in sales. Hexcel beat the earnings forecast by a penny, earning $0.50 per share, but its sales came up short at $496.4 million.Image source: Getty Images.Hexcel Q3 earningsSales "missed estimates," bu ...