You're welcome, glad to help answer questions. I'm not exactly in grade school anymore, but thankfully I do have a protractor handy! Max angle seems to be about 135°.
Oh, goody thanks so much for that. I does sound a bit more than what the old air used to have, which was restrictive, but still not enough.
I am interested because I like to have it on my lap while lying on a bed or sofa and it really needs to open wide for that position. (this sounded like the kama sutra all of a sudden...)