Pair of white objects flying in sync

Pair of white objects flying in sync
Was going for a walk at sunset tonight (3/17). We’re just outside of dc, to the northwest. The two white objects seemed to be in unison and I didn’t hear any noise from them. I looked it up on flight radar and only saw the one plane (visible at the beginning of the video) passing over but maybe I wasn’t checking correctly.

Time: 7:12pm
Location: just NW of DC, in MD