Back yard waiting for fireworks,local town cancelled program unknown to me.Noticed a lone light in distance(where another town just finished display)first thought it was part of display.But it continued toward my area.As it got closer noticed a blurry shape to it,at that point thought aircraft was in trouble but if so it would be decending.As it got closer noticed the changing light pattern and noticed what appeared to be flares being dropped2 at a time (color same as craft)lasting about 1-2 seconds.It did not pass directly over me and kept its course . There was no sound to it.I have large Oak trees in my yard I lost the craft behind trees. My last visual it seemed to change course westerly.I was both awed and spooked at what i saw. I later realized that no commercial aircraft flew overhead as they usually do during this time. Pittsburgh has approach and departurecorridors in the area. I admit it took awhile to get to sleep.Hope this may help