April 13th, 2018 Update: I have had trouble finding out where this video originated from, however so far there is no proof of hoax. The popular opinion right now is that this video is showing a thunderstorm peeking through a cloud and nothing more. Thanks again to the Out There Channel for noticing that Texas occasionally has "purple rain" and so this explanation seems reasonable.
According to various news outlets, including the UK Daily Star, popular UFO YouTube channel Secureteam10 posted amazing footage of a UFO hovering outside an airplane window. The video was captured by a passenger who was en route from Atlanta to Las Vegas:
While the video is fascinating, I so far cannot find any other witness reports or evidence online to help verify its authenticity. I also can't find the original Secureteam10 YouTube video, either.
If you saw this UFO as well, or have useful information about this case, please report what you know!
Otherwise, share your ideas and theories about this UFO sighting and more in the comments or on social media (Instagram, Facebook, Twitter). Could this be another YouTube hoax? As always, you be the judge!