re: #11 Quoth the raven, Covfefe.
Air fryers are actually a thing. Dunno about similarity or not with a convection oven, but an air fryer is legit. Mrs. Fish and I have one and we use it constantly in place of the deep fryer I got just a couple of years ago.
According to Wikipedia [citation needed] they are the same thing.
We had a convection oven when I was growing up. I guess by calling them air fryers now they can charge more for them.