I was at my cousins house in Calgary to visit him and his wife. We had a large snow fall a day ago and so I was helping clear the ice on the sidewalk. I was just about to smash the ice when a bright reflection in the ice caught my eye. I looked up and a triangular shaped aircraft flew overhead at an amazing speed. The aircraft was a geometric triangle without any identifiable features other than its reflection. It had a straight path as if it had direction. I asked my cousin if he saw it after it flown by, but he saw nothing. I searched the horizon to prove it to him but it was quick. I felt a noticeable temperature drop after this incident even though it was already -11C.