When booking econ class on cx website there are several options of class they don't say what the letter class is but give them names with prices and conditions.
On "Economy Special" the upgrade with points option says that it varies.
What are the variables?
What I would like to do is buy the cheapest econ ticket that allows me to upgrade with points. How do I ensure that when the flight is 6 weeks to 2 months away?
As gold would I have half a chance of an opp up between HKG and LAX in the summer anyway?