9 craft were eventually visible for approximately 5 minutes.

The lead in the formation was a large round light, followed by 7 smaller round lights, with the final craft pulling up the rear being a large rectangle in shape.
When it was decided that it was a single plane pulling a lighted banner, the rear, rectangle craft raised up slowly and SHOT up about halfway up the line of smaller lights and stopped, it then slowly lowered and seemed to pass thru the line of smaller lights, then stopped, then as the last smaller light passed over it, it raised back up level with the rest and continued where it left off, pulling up the rear.
They continued slowly across the sky until out of our sight.
Witness indicates that the date of the sighting is approximate.  PD