Visual stealth is a well-known concept in the world of defence aviation with active camouflage technologies used to illuminate fluorescent panels on the aircraft exterior. Another optical camouflage technique could see electro-chromic polymer materials being applied, coating the aircraft with liquid crystal displays displaying an image such as the sky. Noise-cancelling technologies could also be used to compensate for aircraft noise inside homes, around airports runways while aircraft themselves can be made silent through adapting its high lift devices, undercarriage and cavities.
Courtesy ACARS