No noise no flashing lights very bright disappears

Looking up I saw a really bright orb (brighter than stars)moving slow and steady across the skyline about airline altitude but noticed no noise , no flashing lights like a airplane would have at nite , so I called her out and we both just looked at it while scanning the sky we could see to the north airplanes with lights flashing on their usual routes,we could see this thing gliding across the sky in a route that planes don’t fly near our house was as quick as u turn your head it was gone just kinda went a little dimmer light and object got long thin and vanished within seconds!!