UFO Slice

This object was sighted as the witness was coming into land at San Juan in Puerto Rico and of the bat we can tell that this is not a reflection from a light inside the plane as when the buildings we see that the object goes behind them and remerges. If this is another plane then where is the Navigation lights, These should blink every two to three seconds and in the footage their are no blinking lights. As for a boat this would have to be a pretty fast & big boat to keep pace with the airplane. So what do you guys think this could be??
Thanks to paolo cafarelli for allowing me the use of his footage and to view the original: https://youtu.be/V-QuQuiFtFI

Music Credit: DNA by CO.AG Music
https://www.youtube.com/channel/UCcavSftXHgxLBWwLDm_bNvA
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