Hugh - that is a classic ad.
At the time it was well before TAARSAN with TN and must have referred to an offline system I have never heard of for seat allocation.
The airport dudes then had a landline connection to Franklin St and the seat numbers were allocated from there. I can only assume LOCO was undertaken at the city location as well.
The res room was cavernous even when I joined in 75 as it held a 3 strorey high status board then.
TN came back against that ad with "We have "Susan Jones and ......" then reeled of the names of all the other F/As in employ.
the more you all load, the more comes back!!
Love it.
Best all
EWL