This photo shows American military planes at a Berlin airport in 1948: A black and white photo taken from a high vantage point shows a line of six airplanes parked in a line from a top view. The planes have two propeller engines with a United States star and stripes air insignia. Trailer trucks are backing up to the rear doors of the planes, which are open. Large rectangular containers fill the trailers Public Domain Which statement explains the controversy surrounding the purpose of the planes? Breaking the Berlin Blockade would lead to war with the Soviet Union. The Berlin Blockade did not impact the U. S controlled zone of Germany. The U. S was isolationist so to help Berlin would break that policy. The planes were transporting captured Nazi materials to Allied areas of West Germany.