PASSAGES catered only to the full fare Business and First Class passengers. You get zilch miles if you have an economy class ticket. When PASSAGES was around, economy class passengers were not recognised by their patronage. All maybe with the exception of CX's MARCO POLO CLUB. The MPC then was only a loyalty programme whereas PASSAGES was the award programme.
Flights flown on CX in economy class had to be credited to another airline programme that allows accrual when PASSAGES did not.
I flew on a lot of CX coach flights in the 90's and started accruing loyalty points in MPC and award points in ANSETT AUSTRALIA's FF programme who were partners with CX, MH then.