a prototype aircraft that flies by itself at five times the speed of sound has recently been unveiled in the us . Its futuristic shape has led to the speculation that a secret full-size version of the plane could be responsible for ufo (unidentified flying object) sightings. The wedge-shaped LoFlyte's (low observable flight test experiment) model is a product of joint research by the National Aeronautics and Space Administration ( nasa) and the us Air Force into ultra-fast planes capable of more than 4,827 kmph, a speed that would enable them to fly from New York to London in an hour.

The LoFlyte design is known as a