Originally Posted by christep
I can buy whatever published fare I want that would be valid on that flight, so I will normally buy the cheapest mileage-earning fare. Diamond members still have to meet all the other rules associated with that fare (so if the Fare Rules say "not valid on flight CX123" then I can't use that fare on CX123) - it's simply that no available economy fare class sells out as far as Diamonds are concerned.
Does it mean that the Diamond members have the guaranteed right to buy (any number of) tickets at the lowest fare where CX has sold or offered any tickets for the flight?