The PAK DA (or PAK-DA), is a next generation strategic bomber which is being developed by Russia. It stands for Perspektivnyi Aviatsionnyi Kompleks Dalney Aviatsyi (Перспективный авиационный комплекс дальней авиации in Russian) which means Future Air Complex for Strategic Air Forces. The PAK DA is going to be heavily based on Russia's current supersonic bomber Tupolev Tu-160 and is expected to have its maiden flight by 2015.