I remember doing a SYD-MEL charter on the Beech 18 with John Williams as Capt,some time in 1969-70 iirc.
The Monkeys were stacked in their cages and being a rear door only type it was kind of creepy having 60 or so soft little hands grabbing as you slid a- long the top to the front seat.I cannot begin to describe the smell when those 985's started.
Seem's so long ago
Regards........