At approximately 1845, I walked out of my house in Layton, Utah to go to the store. It was very dark out, an overcast of thin clouds with about a 1500 foot ceiling based on the commerical airliners landing at Salt Lake International airport at the south end of the Great Salt Lake. As I took out my car keys from my jacket, I happened to look up to the north end of the valley and saw several aircraft on final descent to the airport. As I was watching them for a moment, I also noticed what appeared to be three lights (white, red, and another white) horizontal to each other skipping between the landing aircaft. The unidentified lights traveled from the north end of the valley to what appeared to the the airport in about 10 seconds or less and I estimate the distance to be about 30 miles or so in that 10 seconds. It did not fly in an straight line, but seemed to hop skip a little above and below as it traveled horizontally. I think the pilots making their approach may have seen this event as it seemed to be in their line-of-sight.