Well a bit opinion from Hong Kong.
I dont know whether you guys have heard of "SARS" in 2003. It was also a pandemic disease which had an outbreak in mainly Asia.
Hong Kong was one of the most seriously affected place and the death rate of the disease we had here was up to 15-20%.
At that time, as a major global hub, the number of flights in Hong Kong were decreased by almost 80%.
Of course the crisis ended eventually but there is still no vaccine for the virus up to this day actually. The virus itself just magically disappeared.
One concrete data can be shared is that after the end of the crisis (which lasted for around 4-5 months in 2003), the tourism in Hong Kong had been in its historical low.
And eventually it took us around 3 months after the crisis had ended to restore to the pre-SARS level of passenger flow.
I'm not being too optimistic but what I can say is that once the situation of C-19 is controlled, the industry will definitely recover in a very rapid rate.
So let's cross our fingers and hope that the situation will soon get better.