Formation over Rutledge, PA

The report, as filed

While sitting on my elevated deck, looking South/South East, I noticed what at first looked like a Dark Spot in the sky. I lost site of it due to a large tree. Approximately 15 seconds later, I heard a very low "Humming" Sound, but could not associate it with anything. Suddenly my Wife and I could clearly see two "Black Squares" about 15 by 15 feet flying over our house at an approximate altitude of 100 fee, Approximately 20 MPH, flying North North West, then slowly turning towards North North East in the direction of the Philadelphia Airport. The "Wingman" swung from the right to left of the leader in a graceful and unusual motion, remaining somewhat level. We saw No lights, until they past over us then strange Pure White Rectangular Lights in a row (Approx. 3 on each side flashing from outer to inner), at less then a second per flash. We have a Boeing Plant South East of us. At first I thought it may have been a Top Secret Drone, but the more I think about it, I don't think it was made here. We are pretty close to the Airport for anything that size to be flying that low all blacked out with No Visible Navigation lighting. Witness remains anonymous; provides no contact information. Hoax?? PD

Held as-reported from National UFO Reporting Center (record NUFORC #119603). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.