Airplane passengers surprised by UFO Seoul Korea

A saucer-shaped object appears to zoom past the window of a plane flying over South Korea. Writer speculates

A new video has surfaced that some claim shows a saucer-shaped UFO zooming past the window of a passenger airplane flying over Seoul, South Korea.
In the video, the unidentified passenger is filming the otherwise uneventful view from the plane's window. Suddenly he makes a startled sound as the white saucer-like image comes into view.
Later in the video, the purported UFO image is magnified. Ultimately, it looks more like an ivory colored bowler hat than a piece of futuristic flying technology. Is this just bad computer-generated imagery (CGI) and a cheap hoax from a prankster or a genuine unidentified object caught on film?
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The same writer who speculates on the origin of this object also recently wrote about video taken from one of NASA's live video feeds. In that video, three objects in a triangle formation appear on screen about five minutes into the video. Someone from NASA chimes in to say the object is actually a piece of foil, aka space junk, and that its reflection is giving the appearance of three objects in a triangle formation..