3 lights in trianglular formation over nw dallas

It was late, a few minutes after 11:00 pm when my wife and I and my two young boys had just gotten home from attending a disney on ice at reunion arena in downtown dallas. I had gotten my youngest boy who was 3 at the time from the back of the seat while my wife took some things out of the trunk I turn around to ask my wife a question when I looked up, from a distance I could see three lights coming our way very low and slow,they were in a triangle formation. I asked my wife to look and what she thought about it she thought it was either 3 helicopters or 3 small planes. when they went over us I ask my wife if she could hear anything like roters or motor like a helicopter would sound.
she said I don't hear anything we both looked at each other and quickly ran inside I told her we had just witnessed a ufo it took about a minute or so to to fly over us the objects were heading north.
I was about to call it in but my wife said that they wouldn't believe me(police) but after reading all this, I'm sure there were other witnesses that night.
Date is approximate.  PD