Looks like altocumulus castellanus. Often a sign of some disturbed weather on the way. I usually associate them with summer thunderstorms after a hot day.
Y'all may already know this book.
We used to have it at my old work: Cloudspotter's Guide. Maybe you are members of the Cloud Appreciation Society. Amazon link
That must confuse the Heck outta our friends over in the chemtrail community. Perhaps some secretive group of good guys flew a couple of planes through there with a big vacuum cleaner aboard rather than spraying equipment, and sucked up some of the Evile Chemicals (tm)?
A good day for clouds here with lots of towering convection mingled with clear blue skies and altocumulus.
This plane perfectly crossed the sun from my vantage point and was silhouetted against some iridescence.
Edit: I should add that I couldn't even see the iridescence with the naked eye. This is an unedited phone photo (apart from being cropped), I was just seeing if I could get a good silhouette but the sun was so bright I was basically shooting blind. An earlier one in the sequence had even more lens flare madness going on… this is unedited again.