Seeing an ufo from an airplane window (video)

[pftest]

Im not sure what this is:

http://www.dumpert.nl/mediabase/1092641/c3edd207/curious_stroboscopic_effect.html

Maybe this is an explanation for some sightings seen by airplane passengers.
Or maybe it is an artifact of a bad videocamera and you wouldn't see it with the naked eye.

 

[GeorgCantor]

My best guess would be curved glass reflections. Look at seconds 5 to 8, the reflections are disappearing down the window.

 

[cjl]

That's definitely a camera scanning artifact, caused by the fact that the camera is not scanning the entire field of view at once, and between scanning successive lines, the propeller is moving significantly.