The disclosure herein describes an aircraft assembly tracker system including a user interface configured to display an aircraft part under assembly and overlay one or more zones on the displayed part. The user interface operates on a computing device. The zones represent different panels to be affixed to the aircraft during assembly and their shape displayed on the user interface is identical to the shape of their corresponding panel being affixed to the physical aircraft part. The aircraft assembly tracker system monitors the assembly progress of each zone and automatically alerts aircraft assembly workers when the zone is ready for closure.