There is no consolidated public matrix of Asia-Pacific runway approach categories. The thresholds that define CAT I, CAT II and CAT III are published, but the airport-by-airport certification data is not — many states never filed it. Hong Kong International…

Without CAT III capability, a fog-prone hub's operating floor sits far higher than the 50 metres of Runway Visual Range a CAT IIIB approach can handle. When visibility drops below the airport's limit, landings stop, diversions stack and cancellations begin…

At the early-morning observation, the METAR at the destination reads Runway Visual Range of 1,200 feet — right at a typical CAT II minimum. A dispatcher reads that not as a verdict but as a start point: the forecast calls…