sentences:  The company developed its own aircraft design software, Advanced Aircraft Analysis (AAA), as well as a second design program for a NASA Small Business Innovative Research contract.In 2002 he published "Roskam's Airplane War Stories" a collection of stories about airplane design and analysis and engineering mistakes that were made.Many of the stories are based on his own experiences and have previously been used to demonstrate to young engineers that "when we make mistakes, we kill people".