1976 Sighting - 2 disks over NY city.

This sighting happened when I was ten years old, my apartment window faced south towards the landing pattern of Laguardia airport in NY.  I was used to seeing the planes land at night and was familiar with the slow approaches from the south and the west to east patterns of planes landing.  I was also familiar with the airplanes turning in the final approach to the airport at night.  
What I witnessed or thought I did was a disk shaped object with illuminated window panels and blinking red and blue lights on the outer edge of the object traveling east.  At first I thought it to be a blimp traveling west to east or an advertising plane - I had also seen these at night.  What struck me as strange was the speed, sort of a slow deliberate and perpendicular path that was too straight.  I witnessed this and thought the distance to be at least a half mile away which would make the object huge.  
From my vantage point the object moved slowly and did not produce the jet sounds that I could make out from that distance that airplanes usually made.  I still thought it was a single blimp until it reached the far eastern edge of my view and another similar object entered my view from the east but moving in a gyroscopic fashion - at the same plane of the horizon and perpendicular direction.  
I became excited as the first object stopped dead still and seemed to wait as the second object approached from the west.  It was too much for me to believe and I watched for several minutes (about three) before I left the window to get some water and regroup.  
I returned to the window and to my surprise both of the objects had left the area, I remained watching for a long time but did not see them again.  
This has been bugging me for over 25 years, want to know for sure.
Date of event may be approximate.  PD