Black Triangle Sighting in London, Ontario on June 13th 2012 – Driving to work, turning left at light, as I turned I suddenly saw a black triangle hover over the road

I was turning left at the lights, on my usual route to work at dusk. I suddenly noticed there was a huge tower on the corner, but there was no tower, just a black triangular ship that was slowly hovering over the road, steadily flying west to east along the south side of Highway 22 along the north end of London, Canada. It made no sound. I raced up to the lights and chased the ship through the outdoor shopping mall parking lot. I drove the length of the lots to the Walmart where the woods begin. I watched the ship fly over the trees out of sight into the fog. It was 2012, before I owned a smartphone, so I had no camera. All I could do was watch it with eyes peeled every moment until it went out of sight. It was about 60 feet across and not more than 10 storeys up--probably more like 5. It was right above me--and if it made a sound I could not hear it. It is possible it was the x-47b, but what was it doing in Canada--and not on a navy ship?