It has come to my attention that certain “lounge seats” on one type of aircraft did raise up. Continuing to check into all of this.
Anyway, the seats that some folks are throwing around with movable armrests seem to be pre-1980 and limited to Braniff Airlines.
The consensus over there is these are the types of first class seats that they remember from the 1980s. I believe them because these folks are hyper-travelers. (The next two pics were lifted from a third site, Airliners.Net)
United 737
Delta 727
.
National airlines, had seats that had armrests that went up on certain aircraft, but they went out of business in 1980:
The above twitter comment is referring to this seat, that is supposed to come from a TWA L1011. I can't find anything backing that up, except for a random picture on Flickr. Note there are no seatbelts and no seat recline, which is odd for a first class seat. I think this is the "lounge seat" mentioned in my earlier post.