Witness Account

My girlfriend and I saw 3 small white lights (almost like stars) in a triangular formation flying completely silently at less than 1000 feet in altitude and moving at about 300-400 knots, from south to north over US highway 19. Each light was about 100 feet apart. Middle of triangle was completely black and did not reflect any light. Like vanta black. No blinking red or blue strobe lights like normal aircraft would run at night.