dark triangle blanks out stars, lights appear

This event occured north of Toronto, either travelling north from Toronto to AFB Bordon (where my father was posted) or travelling west from Beaverton, ON to AFB Bordon. I recall leaving from celebrating my Aunt's 50th birthday party weekend at the time. She had a condo in Toronto and a cottege in Beaverton, so recalling my 7 year old memory is slightly dusty which is why I don't recall where we were coming from (nor does my family).
My sister and I were in the back seat of the family car and we had our heads up in the rearview window (right. no seat belt requirement then) as we often did. We noticed a black triangle blanking out the stars and very slight amount of high, wispy cloud that evening. We thought it was strange and thought it was even more bizarre when slightly pulsating red lights came on at all three points. It traveled with us 3-5 thousand feet (?) above us and matched our speed.
This only lasted for a few minutes and it took off picking up speed slowly until it was gone.
When I saw the Stealth years later, it prompted me to think again of the object I saw as a child 30 years ago. As my dad worked in aviation at this AFB, I asked him these years later if the Stealth had ever been there at that time. He laughed and said no.
I'm curious if there is anyone else out there that had seen this in the area west to the 400, east to HW 12, South to HWY 7 or north in a line between Beaverton/ Sutton/ Barrie/ Base Bordon.
Thanks!