Actor Ajay Devgn will reportedly direct Amitabh Bachchan in an upcoming film titled 'Mayday' and the project will go on floors by the end of this year. Reportedly, in addition to directing the film, Ajay will star in the thriller as a pilot. Ajay and Amitabh have previously worked together in films like 'Major Saab', 'Khakee' and 'Satyagraha'.