Watching for meteors, saw what look like a cloud to the north in the shape of a very defined rectangle.

Around 510 my husband and I were outside no lights on. Husband said is that a jet stream, we both observed it moving at a brisk rate headed eastbound look like it was a cloud but very defined edges, we thought maybe a sign flying behind a small plane but was moving too fast and no blinking lights noted anywhere on the object. Tried to take a picture with phone but was unable to capture.