DC-10 seating
Dozy,
The Chippindale report mentions that 21 seats were left empty. The DC-10, as configured by most airlines at the time, was for 250-300. 330-350 may have been closer to the norm in more recent years, but in 1979 the standard was for 8-abreast seating and more seat pitch than in later years (versus 9 beginning in the early 80s or so) That suggests ANZ's were normally configured for 258 pax.
BTW, when ANZ started these flights, would anyone recall if they ever used a DC-8? I'm pretty sure that would have stretched its range, and with fewer windows per seat row, I would be surprised.