Craft was about 10 km away from me, moving from east to west above the mountain.

I was a passenger in a moving vehicle on a coastal road close to the town of Eyrarbakki on the southern coast of Iceland. The vehicle was moving at a speed of about 90 km/hour from east to west. I rolled down the window on the passenger side and looked inland towards Ingólfsfjall mountain, close to the town of Selfoss, about 10 km away towards north east. It was a cloudy day and there were scattered showers of rain around the mountain. The cloudy sky was featureless and light gray so that the object stood out against it. I took two pictures, two seconds apart. The object was small seen from such a distance and seemed to move fast from east to west. I used a Samsung Galaxy S23 Ultra phone to take both images. There was only one object that I could see and it was not until I looked at the images that I noticed the changing of shape or rotation of the object and the halo around it. It looked to be dark grey in color.
I have a background in photography and always make sure my lens is clean. I know just as well that something on the lens would not show up sharp like this in the image. As the images are taken from a moving vehicle at such speed it is obvious that the foreground would be blurry from the motion. Only more distant objects would not be affected by this. The level of sharpness in the images is not optimal but it can be determined that the object is at least as far away as the mountain.