Two sets of 3 triangular formation red lights flying northbound, no sound, chemical smell afterwards.

I went to my backyard to let the dog out, and as I was standing there facing south, I saw 3 red lights flying at normal aircraft speed, but in a triangle formation, going north directly my toward me, but very high in the ski. Just as they were about 70 degrees in sight, they gradually faded out. No aircraft sounds, no blinking and the faded one by one.
 As the last one faded, the next set of 3 appeared, same triangle pattern, same exact flight path, same structure, same red light, same fade out.
 I didn’t have my cell phone, so I could not record it, but I went back outside and noticed a very strong chemical, burned plastic smell. And the smell is still happening now, 30 minutes later.