About 15 min into our flight from Kuala Lumpur to Perth, I saw out of the window of the Airbus, a white disc shape in heavy tropical clouds that hanged about 3 km from the plane. We were already at cruising altitude and could just make out the very small patches of land far beneath. There was however in the bank of clouds fairly close to us, something that looked like a house suspended in the cloud. I thought my eyes were tricking me, and that it was a man made structure. When I saw the earth far beneath us in a break in the clouds, I realised that it must be something unexplainable. The object remained there like a house in the clouds, till it disappeared behind the wing of the aircraft. I waited for it to re-apear behind the wing. But it was gone. It looked like the craft displayed on the link. The craft "A8"