Airlines configure their seating arrangements differently. It's better to keep this to an apple-to-apple discussion.
Here's a site that has historical details on Braniff. (See: The Braniff Pages)
They have some really good detail shots of how the 727 interiors were configured, specifically, first class. (See: Braniff "727 Braniff Place")
It looks to me like the arm rests could fold up. I certainly would hope that someone from Trumps campaign has done a modicum of research so he doesn't step in it. It's one thing to have his spokesperson be wrong, but it would be bad for him to say what she did, then have the demoCraps produce these photos of the 727 interiors.
The DC-8s and 707s were similarly configured. The only real change they made was in the late 70s they changed from the psychedelic fabric to brown leather. Otherwise, the seats were the same. (See: Braniff's 727,DC-8 and 747 aircraft in "Ultra Scheme Colors" and "Halston")
Here's the DC-8 of the late 70s/early 80s:
Here's another shot of the first class 727 seating.
