There is also a good chance for huge delay for afternoon/evening mainland arrival flights. I was sitting in the lounge at HGH yesterday for 6 hours waiting for KA621 to get ready. There was one Wuhan lady onboard KA620, taken away immediately after lading, the rest of pax and all crew had to wait in the aircraft for around 6 hours for a test result to come back.
It was a same crew turn around flight and I can clearly tell the captain was quite unhappy about what happened, when he was making onboard announcement.