See mufon case #105762 ufo from airplane. that ufo is similar to one i witnessed in the late winter of 1970 flying over southern alberta. i saw it once and never again until the ufo video appeared on youtube. the one i saw moved slowly from the west towards the southeast. it stopped south of me and hovered for a few minutes at an altitude that appeared about a thousand or so feet (not known exactly). it left at an exceptional speed, straight up until it vanished. there are no words to describe the speed from start to vanish. it moved as if it was not stopped.