three bright amber lights moving in unison

Not really sure if it was a single triangular craft.  Saw three bright amber lights that appeared to be moving in unison.  Two fairly close together, and the other much farther apart from the first two.  Seen in the eastern sky.  Could have been three individual planes, however the lights did not seem to be blinking, and the oddest thing to me was the solid amber color.  Most planes I see are white lights with blue and or red blinking lights. After about 3 minutes they disappeared from view.