Large cigar shaped object flying overhead, no sound.

Large cigar shaped object. White or reflective in the sun. No visible control surfaces, no sound. I have an aviation background and can identify most civilian and military aircraft by shape and sound.
First observed directly above my head as I looked up while in a seated position. Noticed the object, at first glance I thought it must be a plane as we’re in the landing flight path for a regional airport. But I noticed at a longer glance I could not identify it because it had no control surfaces. Not quite sure what to make of it I waited until it had passed my position trying to listen for the sound of the jet engine. It was dead silent. Total observed time was about 20 seconds.
I grabbed my phone to take a picture but it had passed out of view going to the NW. I opened my flight radar app immediately and there was nothing transponding anywhere near me on radar.
Details:
- 8:28-8:29AM Sat Sept 9th 2023
- Not any identifiable aircraft to me
- No flight surfaces of any kind
- No sounds
- Color white or silver
- No visible lights
- Estimated size, about the size of a 747 fuselage from my vantage point.
Fight Characteristics:
- Flying in a straight line at a steady speed
- Heading: 308deg NW coming from the NE
- Estimated altitude 2-5k feet
- Estimated speed 250kph best guess
- Not transponding via flight radar app (screenshot attached)
Environmental Conditions:
- Weather 58deg no clouds, visibility 17 miles wind at ground level 2mph from the North
Barometric pressure: 30.14 inHG
*Three images included. One of the flight radar app at the time. One from my observation point. One of the weather conditions at the time