Airlines and passengers are on guard against a new flu-like virus that originated in Wuhan, China.
Here's an explainer on the airline industry's response to the outbreak so far and its potential financial exposure compared to SARS in 2003, which killed nearly 800 people:
What is the expected financial impact on airlines?
The biggest concern is a sharp drop in travel demand if the virus becomes a pandemic.
During the height of the SARS outbreak in April 2003, passenger demand in Asia plunged 45 percent, according to the International Air Transport Association (IATA).
Cathay cut nearly 40 percent of its flights and reported a financial loss, as did Singapore Airlines Ltd, Japan Airlines Co Ltd and ANA Holdings Inc.
The industry is now more reliant on Chinese travellers.
For example, in Australia, Chinese travellers account for more than 15 percent of international arrivals, up from just 4 percent in 2003, according to Moody's ratings service.
Those travellers, who arrive mostly via mainland carriers, often take domestic flights once they arrive in Australia, pointing to the potential for knock-on effects for the likes of local airline Qantas Airways Ltd if there is a fall in travel demand.
Since 2003, the number of annual air passengers has more than doubled, with China growing to become the world's largest outbound travel market.
In 2003, 6.8 million passengers from China travelled on international flights, and that number has grown by close to 10 times to 63.7 million in 2018, according to data from the country's aviation authority.
Global airline industry revenues more than doubled to $838 billion in 2019 from just $322 billion in 2003, according to IATA data.
"Whether only one secondary market, an entire country or the wider region is impacted is obviously unpredictable and outside of the industry's control," said Brendan Sobie, an independent aviation analyst in Singapore.
Which airlines are heavily exposed?
Many airlines, including Korean Air Lines, Singapore Airlines' budget carrier Scoot, Taiwan's China Airlines Ltd and Japan's ANA announced they were cancelling flights in and out of Wuhan after authorities announced a lockdown.
South Korean budget carrier T'way Air earlier this week postponed the scheduled launch of a new route to the city.
Flight tracking website FlightRadar24 showed that as of 0600GMT on Thursday, 184 Wuhan flights, or 60 percent of the departures listed for the day, had been cancelled.
Wuhan's Tianhe airport serves around 2 percent of China's total air traffic and mainly serves domestic routes. Broker Jefferies estimated 88.8 percent of overall flights are domestic, with China Southern Airlines Co Ltd holding the largest market share at 30 percent.
Are passengers cancelling trips to China?
Hanatour Service Inc, South Korea's largest travel agency, said that cancellations of trips to China increased by about 20 percent this week compared with the same period last year. The figure includes postponements and switches to other destinations, a company official said.
Rajeev Kale, country head for Thomas Cook India's holidays division, said some customers were raising concerns about travelling to China. "Most of our customers are adopting a wait-and-watch approach to see further developments," he said.
Philippine Airlines, Garuda Indonesia and Japan Airlines said there was no slowdown in bookings to and from China yet, while low-cost Filipino carrier Cebu Pacific said some passengers had expressed concerns about whether it was safe to fly but had not cancelled bookings.
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