White circled/disk formed object seen twice in 2 minutes moving across the sky.The object was seen while looking at the condense from a plane. Then suddently a circle/disk shaped object came across the sky in aprox 20 sec, before it disapeared, but about 30 sec later we noticed it again, but this time it was further away. First time we saw it, it moved in many direction, second time it was almost standing still. It didn't make any sound. The weather was clear sky, and about 25 deegrees. The object was white.