Update: In a video (see below) posted to Facebook on 7/21/17 the developers revealed that the final chopper parts will be made available in a future update. The update will include the ability to acquire the pass code to the locked areas in the bunkers. These areas will include the final two parts players need to assemble the chopper, new weapons such as a mini-gun and AK-47, gas and different color paint.
Last Day On Earth is a highly recommended zombie survival game currently available on the Apple App Store, Google Play and Steam. The game has become something of a cult hit due to its deep gameplay and huge potential. The major problem with Last Day is it "still in the beta-testing phase," according to the developer. This not only means certain mechanics might not work in the game, but the game is actually incomplete. It is as if the developer did not expect the Last Day to catch on so fast, or that players would log in enough hours to advance so quickly in the game.