Hovering Over Military Aircraft

I was taking a evening stroll when I heard a convoy of military prop planes. Two passed by and I was intrigued because they did not have any markings on them. I decided to take a picture of the third plane with my iphone 13 to study the planes later. I saw a dark spec in the sky and did not think anything of it. Upon studying the photo the dark spec was in the photo. I zoomed in and noticed a triangular and metallic looking unidentified aerial phenomenon which seemed to be hovering above the plane and observing it. I did a reverse image search on google and several similar photos of triangular objects popped up.