WHILE WALKING ON ATLANTIC BOULEVARD IN JACKSONVILLE I WITNESSED A BOOMERANG SHAPED OBJECT ALMOST COLLIDE WITH A COMMERCIAL AIRLINER

On a clear, cool day in December 1975 I observed a metallic boomerang shaped object have a near miss with a commercial airliner. Initially while walking along Atlantic Boulevard, I noticed the vapor trail of a south bound tri-jet (L-1011 OR DC-10) north of downtown. The estimated altitude was 35-40,00 feet. I then noticed a metallic booomerang shaped object approaching from east over the Atlantic Ocean to west. Initial altitude 20-25,000 feet. With amazing speed and rate of climb, it almost collided with the tri-jet heavy, The jet swived to avoid it, and the miss was so close that the vapor trail of the jet was broken by the object. I was truly terrified a mid-air collision was about to occur, but thankfully it didn't.