It happened on 20 july or few days after. i was reading a book and then i take a look away from the book. i spotted an object in near south very high in the air. it looked like airplane and at first i thought it is. it was moving to the east with the speed of airplane. it was sunny this day with few clouds. few seconds after i spotted it, it went through a small cloud. after he went out of the cloud his visibility was worse and then object has weakened even more. his visibility got worser and worser. than it gradually dissapeared in sunny sky. now, there are few explanations why "airplane" disappeared in the sky where sunny was (no clouds there). maybe he was going upper and upper, that's why it disappeared. it didn't look like it was going upper, maybe he disappeared just because he was moving away from me. but it can't happen like this. if it wouldn't disappeared it would surely be airplane. another explanation is that more moisture was there, that's why it disappeared. after 5 seconds when disappeared i stopped watching it, and then after 10 seconds i was looking for it again but couldn't find it. is this airplane?