Listen we’ve been dealing with Covid for two years… I really think a lot of this is overworked and underpaid employees taking the holiday at home with their family.
If it is, good for them
Sure, people do call in sick when they are not sick but that happens on all holidays and is not the cause of what's going on now. COVID is absolutely raging through these airlines and positive tests prove that.
The good news is that the most severe symptom seems to be a mild fever. Problem is that these workers are now out for 10 days even when they feel 100% better on day 3.
Some of these rules by the WHO and CDC are based on a pre-inocculated period. Exposure to a new Covid-19 virus or a re-exposure should only make you ill for a day or two; so the 10 day period is a bit too long. I'm vax'd and know I've had it since, had a headcold and sniffles for just a day (my own initial Covid-19 was just a 3 day hangover).
So right now the challenge is with rapid tests, which are NOT very effective, is people are getting tested more and once they get a positive, even a false one, means they are now holed up for 10 days. A PCR Is more reliable than an antigen. I think we're going to see some damage with travel for a bit... from both travelers and airline staff who get a positive - be it false or not, means a 10 day quarantine.
Regarding the FlightAware cancels page, it seems its mostly all Chinese carriers.