Originally Posted by
Himeno
Each "ticket" can accommodate up to 4 sectors.

The old paper tickets had a page in a booklet for each sector.
That 4 sector ticket is assigned a single ticket number, eg 001-*97992*342
Tickets can be linked together into a single booking, leading to ticket numbers such as 001-*97992*342-43.
Current IATA e-ticket rules limit it to 4 linked tickets - ie, 16 sectors. (eg 081-4*6850*3443-46)
Paper tickets had no such official limit.
Yes, OK, I understand that
but what did the DONEWC3 fare rules allow back then?
there would be three inter-continental flights
and what - no limit on
intra-continent flights?
sounds like you had 27+ such flights spread between three continents