( Sorry ).
This was the economy class section of a Pan Am 747, circa mid-1960s.
Via retronaut.com
This was apparently a mock-up of a design produced in 1965 for Pan-Am. (see photo below).
The ceiling is too high for it to be an actual airplane. But the basic design and leg room were meant to be to scale.
Via catalign.in
Via retronaut.com
