small spheres flying in formation near approach to Tallahassee airport

The event occurred on the Friday after Thanksgiving 1989 at around 12 noon.  My wife, brother in law, and myself were playing golf at the city course on the south side of Tallahassee, Jake Gaither Golf course.  We teed off in late morning, and were on the 5th hole, a par 3,  around noontime.  Weather was perfect, clear blue sky.  
While waiting to tee off, I noticed a USAIR turboprop flying south along the east edge of the golf course at maybe 1500 ft. altitude.  The plane was approx.  a mile away. It was heading towards Tallahassee regional airport.  
I noticed that it was starting to make a right hand turn for final approach and it was going to collide with a flock of birds that was also flying south.  I watched for a few seconds and as my eyes changed focus from the plane to the birds 
I then realized that the flock of birds was not a flock of birds but rather several small grey spheres flying in formation heading south but at a slightly higher altitude than the! plane, or maybe a little farther east of the plane. 
The plane made its turn and the spheres continued south.  I yelled to my wife and brother in law to look but they could not locate them before they passed behind the trees. 
The entire event lasted about 5-10 seconds.