Hoping to check my understanding regarding upgrading an award ticket using more miles, if anyone is familiar. I am looking to book an award ticket for a "Long" (5001-7500 miles) flight for two family members (I will not be a passenger), however only economy (27k) and premium econ (50k) are available right now. I understand that business space may open up closer to the time of the flight. If that happens, will it be possible to upgrade to business with my miles? And if so would there be a change fee? I notice that one disadvantage is that according to https://flights.cathaypacific.com/en...ard-chart.html the upgrade cost from premium econ to business is 42k for a total of 92k, which is higher than the 88k I believe it would cost for business outright. Thanks!