Dummy aircraft are non-functional models or replicas of real airplanes used primarily for training and simulation purposes. They help pilots and crew practice emergency procedures, familiarization with aircraft systems, and other operational tasks without the risks associated with flying an actual aircraft. These models can also be used in military settings for target practice or to deceive enemy radar systems. By mimicking the appearance of real aircraft, dummy aircraft can mislead adversaries about the presence and capabilities of a nation's air force, contributing to strategic advantages in combat situations.