ATC Assistan's basic task is to assist Controllers during their duty and to Coordinate with Defence sectors for all kind of air movements + creating and activating flight plans, preparing strips with estimates, Coordination with adjacent FIR's specially in Karachi by passing and taking estimates from them, finding clearance for non schedule and military aircraft ATC assistant also called FDA at Radar and Tower some where they are called Coordinators as well they also work in Pre Flight Unit and Rvenue by entering daily flight data into specific software and compiling data on register for record.. on remote places mostly ATC Assistant or supervisors work as a Controller on Towers