5 orange red lights moving over Layton, Utah

Driving east on Oak Hills Drive around 19:30 on Feb. 6, 2012 I saw 5 lights against the mountains to the east.  At first I thought it might be 5 hikers spread out in a long line on the ridge south of Adams Canyon.  But the lights were too bright to have been flashlights at the apparent distance, so I wondered if they could be 5 camp fires.  Then I noticed the lights were moving slowly.  When the top one went above the top of the mountains, I realized they were flying.  The group was moving west or slightly south west.  It was dark, the sun having set around 6:30 or so.
The lights were an orange red color.  I figured it must be 5 people in ultra lights or helicopters.  But the lights were not blinking; they were steady.
I live near the top, east end, of Oak Hills Drive.  When I got home, I stood outside to watch them.  I called my wife out to see them.    There was no sound coming from them.  They stayed somewhat together as a group for a while, but started to drift apart.  Each one either moved at a moderate speed, or appeared to hover for a while.  Several individuals went towards the west, and then circled to the north and back east into view.  Then 2 headed out of view towards the south, south west.  Then 2 more moved out of view in that same direction.
The remaining one came back from the west, and appeared to be coming east towards me, but it gradually grew dimmer and dimmer until it disappeared overhead.  It appeared to have moved up in altitude until no longer visible.