tryangle over tx

a friend an i who were abought 11 or 12 tears old were looking over the dallas sky line on a hill in irving.the lights were moving ,not to fast towards dallas .above us they slowly stoped .they were in a tryangle with one in the front.iam not shure if they were white or orange in color.they were not making a sound.my dad worked at bell helacopter company an i told my friend the reason we couldnt hear them was because they were too high.iam 62 now an i know better.theystoped for a second or two an the one in front went back towards the west then the other two did the same togeather an so on with the resti guess i will dy wondering what they were.
Witness indicates that the date of the incident is approximate.  PD