Saw one, but identified up to three possible UAPs while on a United Airlines flight over Virginia

I took the pictures of the phenomena at 3:36 pm, 21 November 2021. I was on United airlines flight UA 2082, from Orlando, FL (dept- 1:45pm) to Washington Dulles International Airport (arrival 3:50pm).
Pictures were over Northern Virginia (not sure exact location) as the aircraft was 15 minutes from landing. I was on a window seat on the rear and right side of the aircraft.
I saw an almost rectangular, dark shaped object that seemed to be stationary in the sky being that it did not seem to be moving. What surprised me was the size of the object, and the fact that it was stationary/did not seem to be moving. I am in the military and have flown many times over many different countries and have never seen this type of object. I have also seen aerostat air ships, balloons, and even drones from aircraft while in flight, and this object did not look like anything I had ever seen before.
While creating the PDF that I have attached, I saw in one of the pictures that there could have been up to two additional objects (so up to three) instead of the one that I saw. The PDF has pictures and further details related to the phenomena I saw that day.
I am happy to answer further questions.