Since it's so common, I assume you will be able to take a picture similar to the ones we've see and post it for all to see just how common it is. I've lived in the NYC metro area most of my life. The only thing I've seen live that even approximates the video from LA is a Space Shuttle launch. I'm also a pilot (albeit inactive now). I've never seen anything like that in the air either. (And if you haven't flown in a major metropolitan area like NYC, you just cannot imagine how attracted your eyes are to anything in the air that is moving while flying approaches and departures.)
ML/NJ
>>Since it’s so common, I assume you will be able to take a picture similar to the ones we’ve see and post it for all to see just how common it is.<<
That’s already been done. A lot.
However, the reason this is even being discussed is that, although it is a common contrail, it does not look all that common. But it is also not all that uncommon. It is one of the pretty ones.
This from last September
This from 60 years ago in California
Here's one from out in the mountains.
Learn prespective -- as in the drawing kind. Photos (and video) do indeed lie.