Originally Posted by
EBGflyer
I suppose it's not only about crawling the sites, but also having access to the booking system/GDS. Does Hong Kong Airlines use their own booking system?
HK Airlines uses TravelSky as their reservation system (which is sometimes but not always different from booking system). They may not publish to a GDS which you're picking up from your particular combination of sites and point of sale--if I use Google flights in Asia I definitely see HK Airlines as an option.