Most organised outbound tourism from China is canceled right now, though there are of course still independent travelers and probably smaller group travel too.

Most organised outbound tourism from China is canceled right now, though there are of course still independent travelers and probably smaller group travel too. It's also worth noting that the fact that they're Chinese nationals doesn't really move the needle that much on how likely it is that they're infected. About 0.00005% of the mainland China resident population is confirmed to be infected, and the vast majority of those (over 80%) are in Hubei, which given the lockdown makes it very unlikely that you will meet them on an aircraft. Even if you allow for under-reporting the order of magnitude is probably about right. Additionally there are another 50 million Chinese nationals living in other countries, who I would submit are more likely than those resident in China to be traveling right now, and are also far less likely to be infected. This is one reason why the racism seen recently in Australia and UK against Chinese-looking people wearing masks is so ridiculous.