Financially troubled Hawker Beechcraft said that it posted a $90 million net loss in May, including $33 million in operating losses, the Wichita (Kansas) Eagle reported yesterday. In May, the company posted $144.8 million in sales of aircraft, parts and services and $148.1 million in costs related to those sales. Hawker Beechcraft posted $43.8 million in interest expenses, $4.2 million in restructuring charges, $4.8 million in reorganization items, $5.8 million in research and development costs and $19.7 million in selling, general and administrative expenses, it said in a court filing.