It's definitely not a bird, nor a plane. So what was that strange, spherical white object filmed from a commercial airline flying over Iranian airspace? A U.F.O. by the purest definition of the term -- an Unidentified Flying Object, it most definitely is.
However, even some of the most die-hard alien theorists are holding off their calls of alien space craft evidence until more information can be gathered. Some of them say that the object could simply be a drone.
From a 35 second clip of the object flying underneath the airplane that has been uploaded and making the rounds on the internet, the sphere appears to be white, not too large, and has no wings. It seems to be traveling from the right side of the camera's frame to the left at a consistent speed and is flying at a low altitude.