Discovery's popular ''Mighty'' franchise (''Mighty Ships'') continues with ''Mighty Planes,'' which takes to the skies and explores the most impressive aircraft in the world. Each episode highlights one incredible plane, from the world's only flying eye hospital to the largest passenger jet ever built, as it takes on a high-stakes mission from beginning to end. ''Mighty Planes'' brings viewers unprecedented access to the planet's most impressive aircraft with in-depth looks at the science of aviation and the lives of the people responsible for making it all happen.